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All questions of Effects of electric current for Class 10 Exam
To get 2Ω resistance using only 6Ω resistors, the number of them required is- a)2
- b)3
- c)4
- d)6
Correct answer is option 'B'. Can you explain this answer?
To get 2Ω resistance using only 6Ω resistors, the number of them required is
a)
2
b)
3
c)
4
d)
6
|
Avinash Patel answered |
Three resistors of 2Ω is required to get 6Ω because resultant is more than individual so they all must be connected in series.
The potential difference of a circuit is constant. If the resistance of a circuit is doubled, then its current will become;- a)4 I
- b)I/2
- c)2 I
- d)I
Correct answer is 'B'. Can you explain this answer?
The potential difference of a circuit is constant. If the resistance of a circuit is doubled, then its current will become;
a)
4 I
b)
I/2
c)
2 I
d)
I
|
Nisha Choudhury answered |
According to ohm's law
Current (I) = Potential difference (V) / Resistance(R)
If the potential difference is maintained constant and the resistance is changed,
Cureent (I) is inversely proportinal to the reisistance (R)
V = IR --(1)
Now, here V is constant.
Let , new resistance R' = 2R and assume that current flow be I'
So, from (1),
IR = I'. R',
=> IR = I'. 2R,
Therefore, I' = I / 2
So,
If the resistance is doubled by applying the constant potential difference the current becomes the half of the previous.
The water heating rod draws 10 A current when connected to certain power source. The resistance of rod is 12 Ω. The source voltage is:- a)1.2 V
- b)120 V
- c)1200 V
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The water heating rod draws 10 A current when connected to certain power source. The resistance of rod is 12 Ω. The source voltage is:
a)
1.2 V
b)
120 V
c)
1200 V
d)
None of these
|
|
Aditya Kumar answered |
The correct answer is B as Ohm's law:
voltage=current x resistance=12x10=120 V
voltage=current x resistance=12x10=120 V
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Silver is not used to make electric wires.Reason : Silver is a bad conductor.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Silver is not used to make electric wires.
Reason : Silver is a bad conductor.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Ananya Das answered |
Silver is a good conductor of electricity but it is not used to make electric wires because it is expensive.
Overloading is due to- a)Insulation of wire is damaged
- b)fault in the appliances
- c)accidental hike in supply voltage
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Overloading is due to
a)
Insulation of wire is damaged
b)
fault in the appliances
c)
accidental hike in supply voltage
d)
All of the above
|
Rohit Sharma answered |
Overloading occurs when there is any fault in the appliances or the insulation of wire got damaged. It also occurs when there is sudden hike in supply voltage.
The resistance whose V - I graph is given below is
- a)
- b)
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
The resistance whose V - I graph is given below is
a)
b)
c)
d)
|
Prachi shukla answered |
Resistance = slope line of V-I graph
Earth wire carries- a)current
- b)voltage
- c)no current
- d)heat
Correct answer is option 'C'. Can you explain this answer?
Earth wire carries
a)
current
b)
voltage
c)
no current
d)
heat
|
Kiran Mehta answered |
A "grounding" wire on the other hand is a safety wire that has intentionally been connected to earth. The grounding wire does not carry electricity under normal circuit operations. It's purpose is to carry electrical current only under short circuit or other conditions that would be potentially dangerous.
A resistance wire is stretched so as to double its length. Its new resistivity will have a magnitude- a)2 times its original value
- b)4 times its original value
- c)8 times its original valu
- d)same as its original value
Correct answer is option 'D'. Can you explain this answer?
A resistance wire is stretched so as to double its length. Its new resistivity will have a magnitude
a)
2 times its original value
b)
4 times its original value
c)
8 times its original valu
d)
same as its original value
|
|
Anita Menon answered |
When a wire is stretched, its resistivity remains unchanged. It is because resistivity of a conductor depends only on its material and is independent of its length or cross- section area.
What should be the core of an electromagnet?- a)soft iron
- b)hard iron
- c)rusted iron
- d)none of above
Correct answer is option 'A'. Can you explain this answer?
What should be the core of an electromagnet?
a)
soft iron
b)
hard iron
c)
rusted iron
d)
none of above
|
|
Chetna bhatia answered |
A) Soft iron should be the core of an electromagnet.
Soft iron is a ferromagnetic material that can be easily magnetized and demagnetized. When a current flows through the wire coiled around the soft iron core, it creates a magnetic field. The soft iron core intensifies the magnetic field by concentrating the magnetic flux lines within it. This results in a stronger magnetic force than the wire alone could produce. Therefore, soft iron is the ideal core material for electromagnets.
Hard iron, on the other hand, is a type of ferromagnetic material that is difficult to magnetize and demagnetize. Rusted iron is not suitable for a core material as it is corroded and not a good conductor of electricity. Hence, the correct answer is (a) soft iron.
Soft iron is a ferromagnetic material that can be easily magnetized and demagnetized. When a current flows through the wire coiled around the soft iron core, it creates a magnetic field. The soft iron core intensifies the magnetic field by concentrating the magnetic flux lines within it. This results in a stronger magnetic force than the wire alone could produce. Therefore, soft iron is the ideal core material for electromagnets.
Hard iron, on the other hand, is a type of ferromagnetic material that is difficult to magnetize and demagnetize. Rusted iron is not suitable for a core material as it is corroded and not a good conductor of electricity. Hence, the correct answer is (a) soft iron.
All elements of an electric circuit are connected in series except :- a)voltmeter
- b)ammeter
- c)rheostat
- d)resistor
Correct answer is option 'A'. Can you explain this answer?
All elements of an electric circuit are connected in series except :
a)
voltmeter
b)
ammeter
c)
rheostat
d)
resistor
|
Ishan Choudhury answered |
In an electric circuit all other elements are connected in series but a voltmeter is connected in parallel.
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is- a)current
- b)voltage
- c)resistance
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is
a)
current
b)
voltage
c)
resistance
d)
None of these
|
Meera Rana answered |
In parallel combination voltage remains same across two points.
In Fleming’s left-hand rule the thumb indicates the direction of- a)magnetic field applied
- b)current flown in the conductor
- c)induced current
- d)mechanical force on the conductor
Correct answer is option 'D'. Can you explain this answer?
In Fleming’s left-hand rule the thumb indicates the direction of
a)
magnetic field applied
b)
current flown in the conductor
c)
induced current
d)
mechanical force on the conductor
|
|
Krishna Iyer answered |
In Fleming’s left-hand rule the thumb indicates the direction of mechanical force acting on the conductor. The forefinger points in the direction of magnetic field and the central finger in the direction of current flowing in the conductor.
The resistance of an alloy :- a)increases with temperature
- b)decreases with temperature
- c)is constant with rise in temperature
- d)is zero
Correct answer is option 'A'. Can you explain this answer?
The resistance of an alloy :
a)
increases with temperature
b)
decreases with temperature
c)
is constant with rise in temperature
d)
is zero
|
|
Bibek Iyer answered |
The resistance of an alloy increases with temperature.
When an electric current flows through a material, it encounters resistance, which is the opposition to the flow of electric charge. The resistance of a material depends on various factors, including temperature.
The resistance of most materials, including metals and alloys, increases with an increase in temperature. This phenomenon is referred to as the positive temperature coefficient of resistance.
Factors contributing to the increase in resistance with temperature:
As the temperature of a material increases, the atoms or ions in the material gain thermal energy and start vibrating more vigorously. This increased atomic vibration leads to more frequent collisions between the moving electrons and the vibrating atoms. These collisions impede the flow of electrons, increasing the resistance.
The increased atomic vibrations also result in more collisions between the electrons and the atoms. These collisions scatter the electrons, making it more difficult for them to move through the material. Consequently, the resistance of the material increases.
At higher temperatures, the electron mobility, which is the ability of electrons to move freely in a material, decreases. This decrease in electron mobility further contributes to the increase in resistance.
There are a few materials, such as certain semiconductors and superconductors, that exhibit a negative temperature coefficient of resistance. In these materials, the resistance decreases with an increase in temperature.
In the case of alloys, which are typically metallic substances composed of two or more elements, the resistance increases with temperature due to the increased atomic vibrations, electron-atom collisions, and reduced electron mobility. This phenomenon is important to consider in various applications, such as electrical circuits and devices, where temperature changes can affect the overall performance and efficiency.
Explanation:
When an electric current flows through a material, it encounters resistance, which is the opposition to the flow of electric charge. The resistance of a material depends on various factors, including temperature.
Effect of Temperature on Resistance:
The resistance of most materials, including metals and alloys, increases with an increase in temperature. This phenomenon is referred to as the positive temperature coefficient of resistance.
Factors contributing to the increase in resistance with temperature:
1. Atomic Vibrations:
As the temperature of a material increases, the atoms or ions in the material gain thermal energy and start vibrating more vigorously. This increased atomic vibration leads to more frequent collisions between the moving electrons and the vibrating atoms. These collisions impede the flow of electrons, increasing the resistance.
2. Electron-Atom Collisions:
The increased atomic vibrations also result in more collisions between the electrons and the atoms. These collisions scatter the electrons, making it more difficult for them to move through the material. Consequently, the resistance of the material increases.
3. Changes in Electron Mobility:
At higher temperatures, the electron mobility, which is the ability of electrons to move freely in a material, decreases. This decrease in electron mobility further contributes to the increase in resistance.
Exceptions:
There are a few materials, such as certain semiconductors and superconductors, that exhibit a negative temperature coefficient of resistance. In these materials, the resistance decreases with an increase in temperature.
Conclusion:
In the case of alloys, which are typically metallic substances composed of two or more elements, the resistance increases with temperature due to the increased atomic vibrations, electron-atom collisions, and reduced electron mobility. This phenomenon is important to consider in various applications, such as electrical circuits and devices, where temperature changes can affect the overall performance and efficiency.
If the circuit is closed and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
- a)concentric circles
- b)elliptical in shape
- c)straight lines parallel to each other
- d)concentric circles near the point O but of elliptical shapes as we go away from it
Correct answer is option 'A'. Can you explain this answer?
If the circuit is closed and magnetic field lines are drawn over the horizontal plane ABCD, the lines are
a)
concentric circles
b)
elliptical in shape
c)
straight lines parallel to each other
d)
concentric circles near the point O but of elliptical shapes as we go away from it
|
|
Anita Menon answered |
- When a circuit carrying current is closed, it generates a magnetic field around it.
- According to Ampère's circuital law and the right-hand rule, the magnetic field lines around a straight current-carrying conductor form concentric circles.
- These circles are centered on the wire, and their planes are perpendicular to the direction of the current.
- Therefore, on a horizontal plane like ABCD, the magnetic field lines appear as concentric circles, making option A correct.
- According to Ampère's circuital law and the right-hand rule, the magnetic field lines around a straight current-carrying conductor form concentric circles.
- These circles are centered on the wire, and their planes are perpendicular to the direction of the current.
- Therefore, on a horizontal plane like ABCD, the magnetic field lines appear as concentric circles, making option A correct.
Three resistors of 1Ω, 2 Ω and 3 Ω are connected in series with a battery of 12 V as shown in figure. Values of potential differences V1, V2, V3 across the three resistors have respective values :- a)2 V, 4 V, 6 V
- b)6 V, 4 V, 2 V
- c)3 V , 2 V , 1 V
- d)
Correct answer is option 'A'. Can you explain this answer?
Three resistors of 1Ω, 2 Ω and 3 Ω are connected in series with a battery of 12 V as shown in figure. Values of potential differences V1, V2, V3 across the three resistors have respective values :
a)
2 V, 4 V, 6 V
b)
6 V, 4 V, 2 V
c)
3 V , 2 V , 1 V
d)
|
Vp Classes answered |
In series grouping current I is same throughout and potential differences are directly proportional to respective resistances.
In given circuit
∴ V1 = IR1 = 2 A x 1Ω = 2V,
In given circuit
∴ V1 = IR1 = 2 A x 1Ω = 2V,
V2 = IR2 = 2 A x 2 Ω = 4 V and
V3 = IR3 = 2 A x 3 Ω = 6 V.
The strength of the magnetic field around a current-carrying straight conductor- a)is same every where around the conductor
- b)is directly proportional to the square of distance of a point from the conductor
- c)is directly proportional to the current flowing in the conductor
- d)is inversely proportional to the current
Correct answer is option 'C'. Can you explain this answer?
The strength of the magnetic field around a current-carrying straight conductor
a)
is same every where around the conductor
b)
is directly proportional to the square of distance of a point from the conductor
c)
is directly proportional to the current flowing in the conductor
d)
is inversely proportional to the current
|
|
Krishna Iyer answered |
The strength of the magnetic field around a current-carrying straight conductor is directly proportional to the amount of current flowing in the conductor.
When the direction of current through the conductor is reversed, the direction of- a)force is also reversed
- b)force remains same
- c)electromagnetic field is reversed
- d)electric field is also reversed
Correct answer is option 'A'. Can you explain this answer?
When the direction of current through the conductor is reversed, the direction of
a)
force is also reversed
b)
force remains same
c)
electromagnetic field is reversed
d)
electric field is also reversed
|
Drnitin Gopale answered |
Stretch out your hand as per Fleming left-hand rule and then tilt your hand upside down. You can see that the direction of mag field is the same, but the direction of current has reversed as per the question. also, the thumb goes downwards i.e opposite to initial direction. hence, we can see that the direction of force has been reversed.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Insulators do not allow flow of current through themselves.Reason : They have no free-charge carriers.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Insulators do not allow flow of current through themselves.
Reason : They have no free-charge carriers.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
Pranaav Kannan answered |
What is your name? which school?
Who has stated the Right hand Thumb Rule?- a)Orsted
- b)Fleming
- c)Einstein
- d)Maxwell
Correct answer is option 'D'. Can you explain this answer?
Who has stated the Right hand Thumb Rule?
a)
Orsted
b)
Fleming
c)
Einstein
d)
Maxwell
|
Asha Yadav answered |
B) Fleming
The right-hand thumb rule is a mnemonic technique used in electromagnetism to determine the direction of a magnetic field generated by a current-carrying conductor. It was first stated by John Ambrose Fleming, a British physicist and electrical engineer, in the late 19th century. The rule states that if the right hand is used to grip the conductor with the thumb pointing in the direction of the current flow, then the curled fingers will give the direction of the magnetic field.
The right-hand thumb rule is a mnemonic technique used in electromagnetism to determine the direction of a magnetic field generated by a current-carrying conductor. It was first stated by John Ambrose Fleming, a British physicist and electrical engineer, in the late 19th century. The rule states that if the right hand is used to grip the conductor with the thumb pointing in the direction of the current flow, then the curled fingers will give the direction of the magnetic field.
A constant current I flows through a horizontal metal wire in the plane of the paper from east to west as shown in the figure. The direction of magnetic field will be from north to south at a point :
- a)directly above the wire
- b)directly below the wire
- c)on the north side of the wire in the plane of the paper
- d)on the south side of the wire in the plane of the paper
Correct answer is option 'B'. Can you explain this answer?
A constant current I flows through a horizontal metal wire in the plane of the paper from east to west as shown in the figure. The direction of magnetic field will be from north to south at a point :
a)
directly above the wire
b)
directly below the wire
c)
on the north side of the wire in the plane of the paper
d)
on the south side of the wire in the plane of the paper
|
|
Ananya Das answered |
Let a constant current I flows through a horizontal wire from east to west. The direction of magnetic field, as per right-hand thumb rule, will be from north to south at a point directly below the current-carrying wire.
The area around a magnet, in which its influence (force of attraction or repulsion) can be felt, is called its- a)magnetic field
- b)magnetic strength
- c)magnetic power
- d)magnetic intensity
Correct answer is option 'A'. Can you explain this answer?
The area around a magnet, in which its influence (force of attraction or repulsion) can be felt, is called its
a)
magnetic field
b)
magnetic strength
c)
magnetic power
d)
magnetic intensity
|
|
Akshara kulkarni answered |
The region around a magnet, in which its influence can be felt, is called its magnetic field
Choose the wrong statement out of the following :- a)Magnetic poles always exist in pairs
- b)Magnetic poles must have same magnetic strength
- c)Like magnetic poles attract each other
- d)Unlike magnetic poles attract each other
Correct answer is option 'C'. Can you explain this answer?
Choose the wrong statement out of the following :
a)
Magnetic poles always exist in pairs
b)
Magnetic poles must have same magnetic strength
c)
Like magnetic poles attract each other
d)
Unlike magnetic poles attract each other
|
|
Anoushka nair answered |
Like magnetic poles (say N- and N-poles) always repel each other.
The direction of magnetic field developed around a current-carrying conductor can be easily found by the use of- a)Right-hand thumb rule
- b)Left-hand thumb rule
- c)Fleming’s left-hand rule
- d)Fleming’s right-hand rule
Correct answer is option 'A'. Can you explain this answer?
The direction of magnetic field developed around a current-carrying conductor can be easily found by the use of
a)
Right-hand thumb rule
b)
Left-hand thumb rule
c)
Fleming’s left-hand rule
d)
Fleming’s right-hand rule
|
|
Arun Sharma answered |
The direction of magnetic field developed around a current-carrying conductor can be found by the use of right-hand thumb rule.
For a current in a long straight solenoid N-pole and S-poIe are created at the two ends. Among the following statements, the incorrect statement is- a)The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid.
- b)The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil.
- c)The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.
- d)The N-pole and S-pole exchange position when the direction of current through the solenoid is reversed.
Correct answer is option 'C'. Can you explain this answer?
For a current in a long straight solenoid N-pole and S-poIe are created at the two ends. Among the following statements, the incorrect statement is
a)
The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid.
b)
The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil.
c)
The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet.
d)
The N-pole and S-pole exchange position when the direction of current through the solenoid is reversed.
|
|
Ananya Das answered |
A solenoid behaves like a bar magnet. Hence the pattern of magnetic field associated with solenoid and around the bar magnet is same.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : If a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.Reason : The current is directly proportional to the potential difference.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : If a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.
Reason : The current is directly proportional to the potential difference.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Avinash Patel answered |
According to Ohm's law, the potential difference across a conductor is directly proportional to the current through it.
V=IR
Hence the curve is a straight line passing through the origin.
The strength of magnetic field along the axis of a solenoid coil :- a)increases on increasing current flowing through the solenoid coil
- b)increases on increasing the number of turns in the solenoid coil
- c)increases on introducing a soft iron core inside the solenoid coil
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
The strength of magnetic field along the axis of a solenoid coil :
a)
increases on increasing current flowing through the solenoid coil
b)
increases on increasing the number of turns in the solenoid coil
c)
increases on introducing a soft iron core inside the solenoid coil
d)
all of the above
|
Pallavi kulkarni answered |
The strength of magnetic field along the axis of a solenoid coil increases on increasing the current flowing through the solenoid coil and on increasing the number of turns in the solenoid coil. Moreover, if a soft iron core is inserted inside the solenoid coil then magnetic field increases many fold.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.Reason : Alloys do not oxidise (burn) readily at high temperatures.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.
Reason : Alloys do not oxidise (burn) readily at high temperatures.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Alekhya garg answered |
Assertion: Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.
Reason: Alloys do not oxidise (burn) readily at high temperatures.
Explanation:
Alloys are commonly used in electrical heating devices due to their unique properties that make them suitable for such applications. Let's analyze the given assertion and reason in detail:
Assertion (A): Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.
This statement is true. Alloys, which are a combination of two or more metals, are widely used in electrical heating devices. This is because alloys have several desirable properties that make them suitable for such applications. For example, alloys have a high melting point, good electrical conductivity, and excellent heat resistance. These properties allow the alloys to withstand the high temperatures generated by the heating elements in devices like electrical irons and toasters.
Reason (R): Alloys do not oxidise (burn) readily at high temperatures.
This statement is also true. Alloys are specifically designed to resist oxidation at high temperatures. When metals are combined to form an alloy, their individual properties change, and the alloy becomes more resistant to oxidation compared to the pure metals. The presence of different metals in the alloy creates a protective layer on the surface, preventing the underlying metals from reacting with oxygen in the air and forming oxides. This protective layer helps the alloy to retain its structural integrity even at high temperatures, reducing the risk of burning or oxidizing.
Conclusion:
Both the assertion and reason are true, and the reason correctly explains why alloys are commonly used in electrical heating devices. The unique properties of alloys, including their resistance to oxidation at high temperatures, make them ideal for such applications. Therefore, the correct choice is option 'A': Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
Reason: Alloys do not oxidise (burn) readily at high temperatures.
Explanation:
Alloys are commonly used in electrical heating devices due to their unique properties that make them suitable for such applications. Let's analyze the given assertion and reason in detail:
Assertion (A): Alloys are commonly used in electrical heating devices, like electrical iron, toasters etc.
This statement is true. Alloys, which are a combination of two or more metals, are widely used in electrical heating devices. This is because alloys have several desirable properties that make them suitable for such applications. For example, alloys have a high melting point, good electrical conductivity, and excellent heat resistance. These properties allow the alloys to withstand the high temperatures generated by the heating elements in devices like electrical irons and toasters.
Reason (R): Alloys do not oxidise (burn) readily at high temperatures.
This statement is also true. Alloys are specifically designed to resist oxidation at high temperatures. When metals are combined to form an alloy, their individual properties change, and the alloy becomes more resistant to oxidation compared to the pure metals. The presence of different metals in the alloy creates a protective layer on the surface, preventing the underlying metals from reacting with oxygen in the air and forming oxides. This protective layer helps the alloy to retain its structural integrity even at high temperatures, reducing the risk of burning or oxidizing.
Conclusion:
Both the assertion and reason are true, and the reason correctly explains why alloys are commonly used in electrical heating devices. The unique properties of alloys, including their resistance to oxidation at high temperatures, make them ideal for such applications. Therefore, the correct choice is option 'A': Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion: Tungsten metal is used for making filaments of incandescent lamps.Reason : The melting point of tungsten is very low.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion: Tungsten metal is used for making filaments of incandescent lamps.
Reason : The melting point of tungsten is very low.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
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|
Arun Sharma answered |
Tungsten is selected for making filaments of incandescent lamp bulbs because tungsten can sustain high temperature and it has a high melting point, with high resistivity.
The strength of a magnetic field inside a long current-carrying straight solenoid coil is- a)more at the ends than at the centre
- b)minimum in the middle
- c)same at all points
- d)found to increase from one end to the other
Correct answer is option 'C'. Can you explain this answer?
The strength of a magnetic field inside a long current-carrying straight solenoid coil is
a)
more at the ends than at the centre
b)
minimum in the middle
c)
same at all points
d)
found to increase from one end to the other
|
|
Rajani dasgupta answered |
The strength of a magnetic field inside a long, current-carrying, straight solenoid is uniform at all points. Moreover, the field depends on the amount of current flowing and the number of turns in solenoid coil besides its length
The most important safety method used for protecting home appliances from short circuiting or overloading is- a)earthing
- b)use of fuse
- c)use of stabilizers
- d)use of electric meter
Correct answer is option 'B'. Can you explain this answer?
The most important safety method used for protecting home appliances from short circuiting or overloading is
a)
earthing
b)
use of fuse
c)
use of stabilizers
d)
use of electric meter
|
Niharika Mehta answered |
The most important safety, method used for protecting home appliances from short circuiting or overloading is the electric fuse. This is a safety device having thin wire of short length made of tin (25%) and lead (75%) alloy having low melting point around 200degree. The fuse wire is of chosen thickness, so as to fix its resistance and hence amount of heating on passage of a particular amount of current. Whenever current through the fuse exceeds the set limit, the fuse wire melts and breaks the circuit. This saves the main circuit components from damage.
A current-carrying conductor is placed perpendicular to the direction of a uniform magnetic field. The direction of force acting on the conductor due to magnetic field is given by- a)Maxwell’s cork screw rule
- b)Ampere’s rule
- c)Fleming’s left-hand rule
- d)Fleming’s right-hand rule
Correct answer is option 'C'. Can you explain this answer?
A current-carrying conductor is placed perpendicular to the direction of a uniform magnetic field. The direction of force acting on the conductor due to magnetic field is given by
a)
Maxwell’s cork screw rule
b)
Ampere’s rule
c)
Fleming’s left-hand rule
d)
Fleming’s right-hand rule
|
Parth Basu answered |
A current carrying conductor when placed at right angle to a magnetic field, experiences a force due to a which we get motion. The direction of the force is given by Fleming’s left hand rule.
Assertion (A): The direction of force on a current-carrying conductor placed in a magnetic field depends on the direction of both the current and the magnetic field.Reason (R): When the direction of the current through the conductor is perpendicular to the direction of the magnetic field, the force experienced by the conductor is at its maximum.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The direction of force on a current-carrying conductor placed in a magnetic field depends on the direction of both the current and the magnetic field.
Reason (R): When the direction of the current through the conductor is perpendicular to the direction of the magnetic field, the force experienced by the conductor is at its maximum.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
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Kamna Science Academy answered |
- The assertion that the force on a current-carrying conductor in a magnetic field depends on the directions of both the current and the magnetic field is correct. This relationship is described by the right-hand rule for the force on a current-carrying conductor in a magnetic field.
- The reason that the force is maximum when the current is perpendicular to the magnetic field is also correct. This is a fundamental principle of electromagnetism.
- However, the reason does not directly explain why the assertion is true. While it is true that the force is maximum when the current is perpendicular to the magnetic field, this fact alone does not fully explain the dependence of the force on the directions of both the current and the magnetic field. Hence, Option B is the correct answer.
Assertion (A): The magnetic field lines around a bar magnet are closed curves.Reason (R): Inside the magnet, the direction of field lines is from its south pole to its north pole.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): The magnetic field lines around a bar magnet are closed curves.
Reason (R): Inside the magnet, the direction of field lines is from its south pole to its north pole.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
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Elite Coaching Classes answered |
- Assertion (A) is true; magnetic field lines around a bar magnet are indeed closed curves.
- Reason (R) is also true; inside the magnet, the direction of field lines runs from its south pole to its north pole.
- However, the Reason does not correctly explain Assertion, as the closure of field lines is a consequence of the overall magnetic field configuration rather than just the direction of the field lines inside the magnet.
What does the straight-line V-I graph indicate about a metallic wire?- a)The resistance of the wire increases with current.
- b)The potential difference is not proportional to the current.
- c)The potential difference increases linearly with current.
- d)The wire does not follow Ohm's Law.
Correct answer is option 'C'. Can you explain this answer?
What does the straight-line V-I graph indicate about a metallic wire?
a)
The resistance of the wire increases with current.
b)
The potential difference is not proportional to the current.
c)
The potential difference increases linearly with current.
d)
The wire does not follow Ohm's Law.
|
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Kamna Science Academy answered |
According to Ohm's Law, for a given metallic wire at constant temperature, voltage (V) is directly proportional to current (I). The straight-line graph passing through the origin indicates this linear relationship
Which factor must remain constant for Ohm's Law to be valid?- a)Voltage
- b)Current
- c)Temperature
- d)Resistance
Correct answer is option 'C'. Can you explain this answer?
Which factor must remain constant for Ohm's Law to be valid?
a)
Voltage
b)
Current
c)
Temperature
d)
Resistance
|
Gowri Mehta answered |
Understanding Ohm's Law
Ohm’s Law is a fundamental principle in electrical engineering and physics, stating that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. The relationship is expressed as:
I = V/R
To ensure the validity of Ohm's Law, certain conditions must be maintained.
Constant Temperature
- Resistance Variation: Resistance is influenced by temperature. As temperature increases, the resistance of most conductors also increases, leading to a deviation from Ohm's Law. Therefore, for Ohm's Law to hold true, resistance must remain constant, which is generally achieved by maintaining a constant temperature.
- Material Properties: Different materials exhibit different resistive properties at varying temperatures. For example, metals typically exhibit increased resistance with rising temperatures, while semiconductors may behave differently.
- Practical Implications: In practical circuits, if the temperature changes significantly, the resistance may vary, thus affecting the current for a given voltage. This is particularly important in electronic devices and circuits where temperature control is essential for performance.
Other Factors
- Voltage (a): While voltage can vary, Ohm's Law still applies as long as the other conditions are met.
- Current (b): Similar to voltage, current can change; it is the result of the interplay between voltage and resistance.
- Resistance (d): Resistance can vary based on the material and dimensions of the conductor, but for Ohm’s Law to be valid, it must remain constant, which is primarily controlled by temperature.
In conclusion, the constant temperature ensures that resistance remains unchanged, making Ohm's Law applicable.
Ohm’s Law is a fundamental principle in electrical engineering and physics, stating that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. The relationship is expressed as:
I = V/R
To ensure the validity of Ohm's Law, certain conditions must be maintained.
Constant Temperature
- Resistance Variation: Resistance is influenced by temperature. As temperature increases, the resistance of most conductors also increases, leading to a deviation from Ohm's Law. Therefore, for Ohm's Law to hold true, resistance must remain constant, which is generally achieved by maintaining a constant temperature.
- Material Properties: Different materials exhibit different resistive properties at varying temperatures. For example, metals typically exhibit increased resistance with rising temperatures, while semiconductors may behave differently.
- Practical Implications: In practical circuits, if the temperature changes significantly, the resistance may vary, thus affecting the current for a given voltage. This is particularly important in electronic devices and circuits where temperature control is essential for performance.
Other Factors
- Voltage (a): While voltage can vary, Ohm's Law still applies as long as the other conditions are met.
- Current (b): Similar to voltage, current can change; it is the result of the interplay between voltage and resistance.
- Resistance (d): Resistance can vary based on the material and dimensions of the conductor, but for Ohm’s Law to be valid, it must remain constant, which is primarily controlled by temperature.
In conclusion, the constant temperature ensures that resistance remains unchanged, making Ohm's Law applicable.
If a wire follows Ohm's Law, what type of graph is obtained when potential difference (V) is plotted against current (I)?- a)A curved line
- b)A straight line passing through the origin
- c)A horizontal line
- d)A vertical line
Correct answer is option 'B'. Can you explain this answer?
If a wire follows Ohm's Law, what type of graph is obtained when potential difference (V) is plotted against current (I)?
a)
A curved line
b)
A straight line passing through the origin
c)
A horizontal line
d)
A vertical line
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Kds Coaching answered |
The V-I graph for an ohmic conductor is a straight line that passes through the origin, showing a direct proportionality between voltage and current.
Assertion (A): When a circular loop of wire lies in the plane of the table with current passing through it clockwise, the magnetic field direction inside and outside the loop can be determined using the right-hand rule.Reason (R): The magnetic field in a given region is uniform.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): When a circular loop of wire lies in the plane of the table with current passing through it clockwise, the magnetic field direction inside and outside the loop can be determined using the right-hand rule.
Reason (R): The magnetic field in a given region is uniform.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
|
Kavya Shah answered |
Assertion Analysis
The assertion states that when a circular loop of wire carries a clockwise current, the magnetic field direction inside and outside the loop can be determined using the right-hand rule. This is correct:
- When you curl the fingers of your right hand in the direction of the current (clockwise in this case), your thumb points downward, indicating that the magnetic field inside the loop is directed downwards.
- Outside the loop, the magnetic field lines point outwards, following the right-hand rule.
Thus, the assertion is true.
Reason Analysis
The reason provided claims that the magnetic field in a given region is uniform. This statement is not necessarily true:
- The magnetic field produced by a circular loop is not uniform; it varies in strength and direction depending on the position in relation to the loop.
- Inside the loop, the magnetic field is relatively uniform compared to the outside, but it is not uniform across the entire region.
Therefore, while the assertion is true, the reason is false.
Conclusion
Combining these analyses leads to the conclusion:
- Both the assertion and reason are not correctly aligned in terms of explanation.
- Thus, the correct answer is option 'B': both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
This separation of understanding clarifies the relationship between the magnetic field's behavior around a current-carrying loop and the misconceptions about uniformity in magnetic fields.
The assertion states that when a circular loop of wire carries a clockwise current, the magnetic field direction inside and outside the loop can be determined using the right-hand rule. This is correct:
- When you curl the fingers of your right hand in the direction of the current (clockwise in this case), your thumb points downward, indicating that the magnetic field inside the loop is directed downwards.
- Outside the loop, the magnetic field lines point outwards, following the right-hand rule.
Thus, the assertion is true.
Reason Analysis
The reason provided claims that the magnetic field in a given region is uniform. This statement is not necessarily true:
- The magnetic field produced by a circular loop is not uniform; it varies in strength and direction depending on the position in relation to the loop.
- Inside the loop, the magnetic field is relatively uniform compared to the outside, but it is not uniform across the entire region.
Therefore, while the assertion is true, the reason is false.
Conclusion
Combining these analyses leads to the conclusion:
- Both the assertion and reason are not correctly aligned in terms of explanation.
- Thus, the correct answer is option 'B': both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
This separation of understanding clarifies the relationship between the magnetic field's behavior around a current-carrying loop and the misconceptions about uniformity in magnetic fields.
What defines a solenoid in the context of magnetic fields?- a)A coil of a few circular turns
- b)A long, straight wire
- c)A coil of many circular turns of insulated wire
- d)A single loop of wire
Correct answer is option 'C'. Can you explain this answer?
What defines a solenoid in the context of magnetic fields?
a)
A coil of a few circular turns
b)
A long, straight wire
c)
A coil of many circular turns of insulated wire
d)
A single loop of wire
|
|
Elite Coaching Classes answered |
In the context of magnetic fields, a solenoid is defined as a coil of many circular turns of insulated wire. Solenoids are crucial components in electromagnets and various electrical devices due to their ability to generate strong and uniform magnetic fields.
Why does a compass needle get deflected when brought near a _____?- a)Plastic rod
- b)Bar magnet
- c)Conductor
- d)Resistor
Correct answer is option 'B'. Can you explain this answer?
Why does a compass needle get deflected when brought near a _____?
a)
Plastic rod
b)
Bar magnet
c)
Conductor
d)
Resistor
|
Nk Classes answered |
A compass needle is affected by magnetic fields. When it is brought near a bar magnet, the magnetic field of the bar magnet causes the needle to deflect. A plastic rod does not produce a magnetic field, so it will not affect the compass needle.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : The electric bulbs glow immediately when the switch is on.Reason : The drift velocity of electrons in a metallic wire is very high.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : The electric bulbs glow immediately when the switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Amit Sharma answered |
In a conductor there are large numbers of free electrons. When we close the circuit, the electric field is established instantly with the speed of electromagnetic waves which causes electron drift at every portion of the circuit. Due to which the current is set up in the entire circuit instantly. The current which is set up does not wait for the electrons to flow from one end of the conductor to another end. Due to this, the bulb glows immediately when the switch is on.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : Heater wire must have high resistance and will be melting point.Reason : If resistance is high, the electric conductivity will be less.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'A'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : Heater wire must have high resistance and will be melting point.
Reason : If resistance is high, the electric conductivity will be less.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Ishan Choudhury answered |
Heater wire must have high resistance and high melting point, because in series current remains same, therefore according to Joule’s law, H= PR t, heat produced is high if R is high melting point must be high, so that wire may not melt with increase in temperature.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When the resistances are connected end- to-end consecutively, they are said to be in series.Reason : In case the total resistance is to be increased, then the individual resistances are connected in series.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : When the resistances are connected end- to-end consecutively, they are said to be in series.
Reason : In case the total resistance is to be increased, then the individual resistances are connected in series.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Anita Menon answered |
- Current in a circuit depends on resistance as well as Potential Difference of the circuit.
- It is necessary to combine two or more resistances to get the required current in the electrical circuits
- Resistances can be combined in two ways: in series and in parallel.
- When two or more resistances are connected end to end consecutively, they are said to be connected in series.
- And on the other hand, when two or more resistances are connected between the same two points, they are said to be connected in parallel.
What happens to the direction of the force on a current-carrying conductor when the direction of the current is reversed, while the magnetic field remains unchanged?- a)The direction of the force remains the same.
- b)The direction of the force is reversed.
- c)The magnitude of the force is doubled.
- d)The force becomes zero.
Correct answer is option 'B'. Can you explain this answer?
a)
The direction of the force remains the same.
b)
The direction of the force is reversed.
c)
The magnitude of the force is doubled.
d)
The force becomes zero.
|
Ciel Knowledge answered |
According to Fleming's left-hand rule, if the direction of the current is reversed while keeping the magnetic field unchanged, the direction of the force on the conductor is also reversed.
Which property of a proton can change while it moves freely in a magnetic field?- a)mass
- b)speed
- c)velocity
- d)momentum
Correct answer is option 'C'. Can you explain this answer?
Which property of a proton can change while it moves freely in a magnetic field?
a)
mass
b)
speed
c)
velocity
d)
momentum
|
|
Gargi Kaur answered |
Understanding Proton Behavior in a Magnetic Field
When a proton moves freely in a magnetic field, certain properties can be affected. Among the options provided, it is crucial to identify which of these can change.
Key Properties of the Proton:
- Mass: The mass of a proton remains constant regardless of its motion or the presence of a magnetic field. It is an intrinsic property of the particle.
- Speed: While a proton's speed can remain constant, it can change depending on external forces acting on it. However, in a uniform magnetic field, the speed does not inherently change due to the field itself.
- Velocity: This is the correct answer. Velocity is a vector quantity that includes both speed and direction. When a proton enters a magnetic field, it experiences a force (Lorentz force) that alters its direction of motion. Thus, while its speed might remain constant, its velocity changes due to the change in direction.
- Momentum: The momentum of a proton (mass times velocity) can also change as a consequence of the change in velocity. However, it is not a direct change in the property itself but rather a result of the change in velocity.
Conclusion:
In summary, as a proton moves freely in a magnetic field, the only property that changes is its velocity due to the alteration in direction caused by the magnetic force. This fundamental understanding is key for applications in fields like particle physics and electromagnetism.
When a proton moves freely in a magnetic field, certain properties can be affected. Among the options provided, it is crucial to identify which of these can change.
Key Properties of the Proton:
- Mass: The mass of a proton remains constant regardless of its motion or the presence of a magnetic field. It is an intrinsic property of the particle.
- Speed: While a proton's speed can remain constant, it can change depending on external forces acting on it. However, in a uniform magnetic field, the speed does not inherently change due to the field itself.
- Velocity: This is the correct answer. Velocity is a vector quantity that includes both speed and direction. When a proton enters a magnetic field, it experiences a force (Lorentz force) that alters its direction of motion. Thus, while its speed might remain constant, its velocity changes due to the change in direction.
- Momentum: The momentum of a proton (mass times velocity) can also change as a consequence of the change in velocity. However, it is not a direct change in the property itself but rather a result of the change in velocity.
Conclusion:
In summary, as a proton moves freely in a magnetic field, the only property that changes is its velocity due to the alteration in direction caused by the magnetic force. This fundamental understanding is key for applications in fields like particle physics and electromagnetism.
Assertion (A): A metallic wire carrying an electric current has associated with it a magnetic field.Reason (R): The field lines about the wire consist of a series of concentric circles whose direction is given by the right-hand rule.- a)If both Assertion and Reason are true and Reason is the correct explanation of Assertion
- b)If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- c)If Assertion is true but Reason is false
- d)If both Assertion and Reason are false
Correct answer is option 'B'. Can you explain this answer?
Assertion (A): A metallic wire carrying an electric current has associated with it a magnetic field.
Reason (R): The field lines about the wire consist of a series of concentric circles whose direction is given by the right-hand rule.
a)
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
b)
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
c)
If Assertion is true but Reason is false
d)
If both Assertion and Reason are false
|
|
Elite Coaching Classes answered |
- The Assertion is correct. When a metallic wire carries an electric current, it generates a magnetic field around it. This phenomenon is a fundamental aspect of electromagnetism.
- The Reason is also correct. The magnetic field around the wire indeed forms concentric circles, and the direction of these circles is determined by the right-hand rule.
- However, the Reason statement is not the correct explanation of the Assertion. While both statements are individually true, the Reason does not directly explain why a metallic wire carrying an electric current produces a magnetic field.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : When the resistances are connected between the same two points, they are said to be connected in parallel.Reason : In case the resistance is to be decreased, then the individual resistances are connected in parallel.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'B'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : When the resistances are connected between the same two points, they are said to be connected in parallel.
Reason : In case the resistance is to be decreased, then the individual resistances are connected in parallel.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
|
|
Rohit Sharma answered |
In parallel connection, all the elements are connected between the same two points hence the voltage drop across any number of resistors or other elements connected in parallel is the same.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : The equation V = Ri does not apply to those conducting devices which do not obey Ohm’s law.Reason : V= RI is a statement of Ohm’s law.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
- e)Both Assertion and Reason are false.
Correct answer is option 'C'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : The equation V = Ri does not apply to those conducting devices which do not obey Ohm’s law.
Reason : V= RI is a statement of Ohm’s law.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
e)
Both Assertion and Reason are false.
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Pooja Shah answered |
It is a common error to say that V = Ri is a statement of Ohm’s law. The essence of Ohm’s law is that the value of R is independent of the value of V . The equation V — Ri is used for. finding resistance of all conducting devices, whether they obey Ohm’s law or not.
The magnetic field inside a long straight solenoid-carrying current _____.- a)is zero.
- b)decreases as we move towards its end.
- c)increases as we move towards its end.
- d)is the same at all points.
Correct answer is option 'D'. Can you explain this answer?
The magnetic field inside a long straight solenoid-carrying current _____.
a)
is zero.
b)
decreases as we move towards its end.
c)
increases as we move towards its end.
d)
is the same at all points.
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Elite Coaching Classes answered |
The magnetic field inside a long straight solenoid carrying current is the same at all points. This characteristic of a solenoid's magnetic field is a key property that remains consistent along its length, providing uniformity in the field distribution.
The magnetic field inside a long straight solenoid carrying current _____.- a)is zero
- b)decreases as we move towards its end
- c)increases as we move towards its end
- d)is the same at all points
Correct answer is option 'D'. Can you explain this answer?
The magnetic field inside a long straight solenoid carrying current _____.
a)
is zero
b)
decreases as we move towards its end
c)
increases as we move towards its end
d)
is the same at all points
|
Top Rankers answered |
The magnetic field inside a long straight solenoid carrying current is the same at all points. This characteristic is a key property of the magnetic field produced by such a configuration.
Chapter doubts & questions for Effects of electric current - Science and Technology Class 10 (Maharashtra SSC Board) 2025 is part of Class 10 exam preparation. The chapters have been prepared according to the Class 10 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 10 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Science and Technology Class 10 (Maharashtra SSC Board)
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