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All questions of Magnetic Effects of Current for Class 10 Exam
The magnetic field lines inside a long current-carrying solenoid are near-
- a)Straight
- b)Circular
- c)Elliptical
- d)Parabolic
Correct answer is option 'A'. Can you explain this answer?
The magnetic field lines inside a long current-carrying solenoid are near-
a)
Straight
b)
Circular
c)
Elliptical
d)
Parabolic
|
Gunjan Lakhani answered |
The field lines inside the solenoid are in the form of parallel straight lines. This indicates that the magnetic field is the same at all points inside the solenoid. That is, the field is uniform inside the solenoid.
Magnetic lines of force originate from the- a)North pole
- b)Center point
- c)South pole
- d)Either north pole or south pole
Correct answer is option 'A'. Can you explain this answer?
Magnetic lines of force originate from the
a)
North pole
b)
Center point
c)
South pole
d)
Either north pole or south pole
|
Ananya Das answered |
The direction of magnetic line of force is the direction of force on a North Pole, so the magnetic lines of force always begin on the North Pole of a magnet and end on the South Pole of the magnet. When a small magnetic compass is placed along a lie of force, it sets itself along the line tangential to it. Hence, the line drawn from the South Pole of the compass to its North pole shows the direction of the magnetic field.
An electric current flowing through a conductor produces
- a)Magnetic field
- b)Electric Field
- c)Electromagnetic field
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
An electric current flowing through a conductor produces
a)
Magnetic field
b)
Electric Field
c)
Electromagnetic field
d)
None of these
|
Vikas Kumar answered |
An electric current through a metallic conductor produces a magnetic field around it.
A magnetic field existing around a magnet can be represented by magnetic field lines. Magnetic field lines always form:- a)open loops
- b)closed loops
- c)straight lines
- d)Both closed loops and straight lines
Correct answer is option 'B'. Can you explain this answer?
A magnetic field existing around a magnet can be represented by magnetic field lines. Magnetic field lines always form:
a)
open loops
b)
closed loops
c)
straight lines
d)
Both closed loops and straight lines
|
Krishna Iyer answered |
Magnetic field lines can never cross, meaning that the field is unique at any point in space. Magnetic field lines are continuous, forming closed loops without beginning or end.
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.
Which of the following metal is not attracted by a magnet?- a)Cobalt
- b)Nickel
- c)Steel
- d)Silver
Correct answer is option 'D'. Can you explain this answer?
Which of the following metal is not attracted by a magnet?
a)
Cobalt
b)
Nickel
c)
Steel
d)
Silver
|
|
Ananya Das answered |
In the natural states, metals such as brass, copper , gold and silver will not attract magnets. This is because they are weak metals to start with. Magnets only attach themselves to strong metals such as iron and cobalt and that is why not all types of metals can make magnets stick to them.
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.
Can you explain the answer of this question below:A vertical wire carries a current straight down. To the east of this wire, the magnetic field points:
- A:
eastwards
- B:
downwards
- C:
southwards
- D:
northwards
The answer is c.
A vertical wire carries a current straight down. To the east of this wire, the magnetic field points:
eastwards
downwards
southwards
northwards
|
|
Anjana Khatri answered |
Use the right hand rule. Point your thumb down. Your fingers curl toward the south when you look on the east side of the wire.
Fuse wire used in lighting circuit is of- a)10 A
- b)15 A
- c)2.5 A
- d)5 A
Correct answer is option 'D'. Can you explain this answer?
Fuse wire used in lighting circuit is of
a)
10 A
b)
15 A
c)
2.5 A
d)
5 A
|
|
Krishna Iyer answered |
Fuse is a piece of wire of a material with a very low melting point. When a high current flows through the circuit due to overloading or short circuit, the wire gets heated and melts. As the result, the circuit is broken and current stops flowing. Hence, the current rating of a fuse is 5 A.
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.
Small current in a circuit is detected by- a)Galvanometer
- b)Solenoid
- c)Voltmeter
- d)Fleming’s left hand rule
Correct answer is option 'A'. Can you explain this answer?
Small current in a circuit is detected by
a)
Galvanometer
b)
Solenoid
c)
Voltmeter
d)
Fleming’s left hand rule
|
|
Ananya Das answered |
Galvanometer is used to detect presence of small current in a circuit
Current flowing in conductors A and B is same, what is the ratio of the magnetic field produced around the conductor A at a distance of 5 cm from the conductor to the magnetic field produced around the conductor B at a distance of 2 cm from this conductor is- a)0.04
- b)0.4
- c)4.0
- d)10
Correct answer is option 'B'. Can you explain this answer?
Current flowing in conductors A and B is same, what is the ratio of the magnetic field produced around the conductor A at a distance of 5 cm from the conductor to the magnetic field produced around the conductor B at a distance of 2 cm from this conductor is
a)
0.04
b)
0.4
c)
4.0
d)
10
|
Indu Gupta answered |
Magnetic field produced is directly proportional to the current flowing and inversely proportional to the distance from the conductor. Since current flowing in both conductors is same only distance matters here. Since field is inversely proportional to distance ;
B(A) / B(B) = d(B) / d ( A) = 0.2/0.5
=> 0.4
B(A) / B(B) = d(B) / d ( A) = 0.2/0.5
=> 0.4
On & off switch is provided with- a)Live and Neutral wire
- b)Live wire
- c)Neutral wire
- d)Earth wire
Correct answer is 'B'. Can you explain this answer?
On & off switch is provided with
a)
Live and Neutral wire
b)
Live wire
c)
Neutral wire
d)
Earth wire
|
Aisha Negi answered |
No current flows through the neutral wire , the technical purpose of switching on and off can be accomplished if switch is connected to the neutral wire but it is a greivious safety hazard since switching off would still current flow in the phase wire ( live wire)
Moving two like poles together usually causes a magnet resting on a table to repel and rotate. This occurs because:- a)Like magnetic poles repel
- b)Unlike magnetic poles attract
- c)Both of these
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Moving two like poles together usually causes a magnet resting on a table to repel and rotate. This occurs because:
a)
Like magnetic poles repel
b)
Unlike magnetic poles attract
c)
Both of these
d)
None of these
|
Ishan Choudhury answered |
Like poles of magnet repel each other and unlike poles of magnet attract each other.
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.
Induced current found to be highest when coil moves- a)At an angle of 45°
- b)At an angle of 20°
- c)Parallel to magnetic field
- d)Right angles to magnetic field
Correct answer is option 'D'. Can you explain this answer?
Induced current found to be highest when coil moves
a)
At an angle of 45°
b)
At an angle of 20°
c)
Parallel to magnetic field
d)
Right angles to magnetic field
|
|
Vikas Kumar answered |
The induced current is found to be the highest when the direction of motion of the coil is at right angles to the magnetic field.
Which of the following properties 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 of the following properties of a proton can change while it moves freely in a magnetic field ?
a)
Mass
b)
Speed
c)
Velocity
d)
Momentum
|
|
Arun Sharma answered |
Each moving charged particle in a magnetic field experiences a force. The direction of force experienced by a positive charge is given by Fleming's left hand rule. The force acting on the proton would change both velocity and momentum.
Which of the following property of a proton can change while it moves freely in a magnetic field? (There maybe more then one correct answers)- a)Mass
- b)Speed
- c)Velocity
- d)Momentum.
Correct answer is option 'C'. Can you explain this answer?
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may
be more then one correct answers)
a)
Mass
b)
Speed
c)
Velocity
d)
Momentum.
|
|
Anjana Khatri answered |
The correct options are (c) and (d). The magnetic force acts perpendicular to the direction of motion of the proton. It does not change its mass and speed but changes its direction of motion. So both velocity and momentum get changed.
In the domestic electric circuits, the red coloured insulated copper wire is called- a)Neutral wire
- b)Fuse wire
- c)Live wire
- d)Earthing wire
Correct answer is option 'C'. Can you explain this answer?
In the domestic electric circuits, the red coloured insulated copper wire is called
a)
Neutral wire
b)
Fuse wire
c)
Live wire
d)
Earthing wire
|
|
Neha Patel answered |
The live wire carries current to the appliance at a high voltage. The neutral wire completes the circuit and carries current away from the appliance. The third wire, called the earth wire (green/yellow) is a safety wire and connects the metal case of the appliance to the earth.
The fact that magnetic field is produced around a wire carrying a current, was discovered by- a)Faraday
- b)Oersted
- c)Maxwell
- d)Joule.
Correct answer is option 'B'. Can you explain this answer?
The fact that magnetic field is produced around a wire carrying a current, was discovered by
a)
Faraday
b)
Oersted
c)
Maxwell
d)
Joule.
|
|
Ravi Sharma answered |
The correct answer is B as e electric current through the copper wire has produced a magnetic . In 1820 he accidentally discovered that a compass needle got deflected ... Through this observation Oersted showed that electricity and . representing the magnetic field around a current-carrying straight wire.
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.
The use of fuses in electric power-lines is :- a)to keep main voltage constant
- b)to open the line permanently when there is an overload
- c)(3) just to show an indication when there is an overload
- d)as a switch to use in an emergency
Correct answer is option 'B'. Can you explain this answer?
The use of fuses in electric power-lines is :
a)
to keep main voltage constant
b)
to open the line permanently when there is an overload
c)
(3) just to show an indication when there is an overload
d)
as a switch to use in an emergency
|
Ishan Khanna answered |
A fuse is used to break the circuit,in order to protect the electrical appliances from damage. In case of overcurrent a fuse melts and breaks the circuit and stops the current flowing through the components. A fuse is made up of a thin material which has a low melting point.
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.
The magnetic field lines inside a current carrying solenoid are :- a)along the axis and parallel to each other
- b)perpendicular to the axis and equidistant from each other
- c)circular and they do not intersect each other
- d)circular at the ends but they are parallel to the axis inside the solenoid
Correct answer is option 'A'. Can you explain this answer?
The magnetic field lines inside a current carrying solenoid are :
a)
along the axis and parallel to each other
b)
perpendicular to the axis and equidistant from each other
c)
circular and they do not intersect each other
d)
circular at the ends but they are parallel to the axis inside the solenoid
|
|
Krishna Iyer answered |
The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet. The magnetic field lines inside the solenoid are in the form of parallel straight lines and along the axis of solenoid.
When a fuse is rated at 8 A, it means :- a)it will not work if current is less than 8 A
- b)it has a resistance of 8 ohm
- c)it will work only if current is 8 A
- d)it will burn if current exceeds 8 A.
Correct answer is option 'D'. Can you explain this answer?
When a fuse is rated at 8 A, it means :
a)
it will not work if current is less than 8 A
b)
it has a resistance of 8 ohm
c)
it will work only if current is 8 A
d)
it will burn if current exceeds 8 A.
|
Rohit Chauhan answered |
It means that it will not work if current is less than 8A. It has a resistance of 8 ohm.
Same amount of current flows in the same direction .long the two parallel conductors separated by a small distance:- a)Both conductors attract each other
- b)Both conductors repel each other
- c)Conductors neither attract each other nor repel each other
- d)Both conductors rotates about their axis.
Correct answer is option 'A'. Can you explain this answer?
Same amount of current flows in the same direction .long the two parallel conductors separated by a small distance:
a)
Both conductors attract each other
b)
Both conductors repel each other
c)
Conductors neither attract each other nor repel each other
d)
Both conductors rotates about their axis.
|
Anshu Shah answered |
F/l is the force per unit length between two parallel currents I1 and I2 separated by a distance r. The force is attractive if the currents are in the same direction and repulsive if they are in opposite directions. This force is responsible for the pinch effect in electric arcs and plasmas.
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.
When current is circular, the associated magnetic field is- a)Straight
- b)Elliptical
- c)Circular
- d)Parabolic.
Correct answer is option 'A'. Can you explain this answer?
When current is circular, the associated magnetic field is
a)
Straight
b)
Elliptical
c)
Circular
d)
Parabolic.
|
Ananya Kumar answered |
When current flows through a straight conductor, it is said that the current is straight. The magnetic field produced due to a straight current carrying conductor is in the form of concentric circles. The centre of the circles lies on the conductor itself and are in the plane perpendicular to the straight conductor. This implies that the magnetic field produced due to straight current is circular.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : In Fleming’s Left Hand Rule, the direction of magnetic field, force and current are mutually perpendicular.Reason : Fleming’s Left hand Rule is applied to measure the induced current.- 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 : In Fleming’s Left Hand Rule, the direction of magnetic field, force and current are mutually perpendicular.
Reason : Fleming’s Left hand Rule is applied to measure the induced current.
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.
|
|
Aditya Shah answered |
It is used to find the direction of force in a current carrying conductor in the presence of a magnetic field.
In all the electrical appliances, the switches are put in the- a)neutral wire
- b)earth wire
- c)live wire
- d)all of above
Correct answer is option 'C'. Can you explain this answer?
In all the electrical appliances, the switches are put in the
a)
neutral wire
b)
earth wire
c)
live wire
d)
all of above
|
|
Vikram Kapoor answered |
If the switch is placed in the neutral wire, the electrical appliance is still connected to the high voltage live wire even when the switch is opened.)
This may cause the user to get an electric shock if he touches the live wire.
That’s why the switches are put in the live wire.
This may cause the user to get an electric shock if he touches the live wire.
That’s why the switches are put in the live wire.
In domestic electric circuits, fuse must be placed in series with- a)Earth wire
- b)Neutral wire
- c)Live wire
- d)Any of the three wires
Correct answer is option 'C'. Can you explain this answer?
In domestic electric circuits, fuse must be placed in series with
a)
Earth wire
b)
Neutral wire
c)
Live wire
d)
Any of the three wires
|
Pooja Choudhury answered |
The fuse wire is always connected in the live wire of the circuit because if the fuse is put in the neutral wire, then due to excessive flow of current when the fuse burns, current stops flowing in the circuit, but the appliance remains connected to the high potential point of supply through the live 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.
For a solenoid carrying a current I and having n turns per unit length, wrapped on a core of permeability ?,the correct expression for magnetic field intensity (2) is- a)B=μo/μ nI
- b)B=μoμI/n
- c) B = μoμnI
- d) B = μoμn / I
Correct answer is option 'C'. Can you explain this answer?
For a solenoid carrying a current I and having n turns per unit length, wrapped on a core of permeability ?,
the correct expression for magnetic field intensity (2) is
a)
B=μo/μ nI
b)
B=μoμI/n
c)
B = μoμnI
d)
B = μoμn / I
|
Janhavi Chakraborty answered |
A simple electromagnet can be created by wrapping a coil of wire around a soft iron The magnetic field strength of an electromagnet is therefore determined by the turns of wire in the coil the greater will be the strength of the magnetic field.
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.
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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.
When the main switch of the house circuit is put off, it disconnects the :- a)live wire
- b)neutral wire
- c)earth wire
- d)live and neutral wires.
Correct answer is option 'D'. Can you explain this answer?
When the main switch of the house circuit is put off, it disconnects the :
a)
live wire
b)
neutral wire
c)
earth wire
d)
live and neutral wires.
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Priya Sengupta answered |
The correct option is D.
In this case when the main switch of the house is switched off it would disconnect the live wire and the neutral wire.
In this case when the main switch of the house is switched off it would disconnect the live wire and the neutral wire.
When current flows anticlockwise in a loop the magnetic polarity of the face is- a)East
- b)South
- c)West
- d)North.
Correct answer is option 'D'. Can you explain this answer?
When current flows anticlockwise in a loop the magnetic polarity of the face is
a)
East
b)
South
c)
West
d)
North.
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Naina Sharma answered |
The polarity of this magnet can be understood with the help of clock face rule. If the current is flowing in anti-clockwise direction, then the face of the loop shows North pole.
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
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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 : AC load line is used for long distance transmission.Reason : It has very less loss of energy in long distance transmission.- 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 : AC load line is used for long distance transmission.
Reason : It has very less loss of energy in long distance transmission.
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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Kiran Mehta answered |
It can be easily transmitted over long distances without much loss in energy.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion : an induced current has a direction such that the magnetic flux that induces the current.Reason : Above statement is in accordance with conservation of energy.- 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 : an induced current has a direction such that the magnetic flux that induces the current.
Reason : Above statement is in accordance with conservation of energy.
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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Nikhila das answered |
Understanding the Assertion and Reason
The assertion (A) states that "an induced current has a direction such that the magnetic flux that induces the current." This is a principle derived from Faraday's Law of Electromagnetic Induction, which indicates that when the magnetic flux through a loop changes, an electromotive force (EMF) is induced in the loop, causing a current to flow in a specific direction.
Explanation of Assertion (A)
- The direction of the induced current opposes the change in magnetic flux, as per Lenz's Law.
- This means if the magnetic flux increases, the induced current will flow in a direction to create a magnetic field opposing the increase, and vice versa.
Understanding the Reason
The reason (R) states that "the above statement is in accordance with conservation of energy." This is true because:
- If the induced current did not oppose the change, it would lead to a violation of energy conservation principles.
- The energy input needed to maintain the change in magnetic flux would be unbounded, which is impossible in a closed system.
Conclusion
- Both the assertion (A) and the reason (R) are true.
- The reason (R) correctly explains why the assertion (A) holds true, emphasizing that the behavior of induced currents is consistent with the conservation of energy.
Thus, the correct answer is option 'A': Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
The assertion (A) states that "an induced current has a direction such that the magnetic flux that induces the current." This is a principle derived from Faraday's Law of Electromagnetic Induction, which indicates that when the magnetic flux through a loop changes, an electromotive force (EMF) is induced in the loop, causing a current to flow in a specific direction.
Explanation of Assertion (A)
- The direction of the induced current opposes the change in magnetic flux, as per Lenz's Law.
- This means if the magnetic flux increases, the induced current will flow in a direction to create a magnetic field opposing the increase, and vice versa.
Understanding the Reason
The reason (R) states that "the above statement is in accordance with conservation of energy." This is true because:
- If the induced current did not oppose the change, it would lead to a violation of energy conservation principles.
- The energy input needed to maintain the change in magnetic flux would be unbounded, which is impossible in a closed system.
Conclusion
- Both the assertion (A) and the reason (R) are true.
- The reason (R) correctly explains why the assertion (A) holds true, emphasizing that the behavior of induced currents is consistent with the conservation of energy.
Thus, the correct answer 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 : A neutral body may experience a net nonzero magnetic force.Reason : The net charge on a current carrying wire is zero, but it can experience a force in a magnetic field.- 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 : A neutral body may experience a net nonzero magnetic force.
Reason : The net charge on a current carrying wire is zero, but it can experience a force in a magnetic field.
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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Anita Menon answered |
A material body is ultimately composed of elementary particles like electrons, protons and neutrons, many of which have an electric charge. A body may be called 'electrically neutral' when adding the electric charges, some of which are positive, some negative and some zero. Of all its constituent elementary particles, the sum is zero. If all the charged elementary particles of a neutral body were at rest (relative to the body itself) then the body would exert no net force on another similar neutral body because the forces exerted by the charged particles of the first body on the charged particles of the second body would exactly cancel. The force between two charged particles also depends on the relative velocity of these particles and therefore, considering that in neutral body, the negative particles (electrons) have high speeds (relative to the body itself) while the positive particles (protons) have small speeds, it is expected (as explained below) that the net electro-dynamic force between two neutral pieces of matter, that is, with electrical field and magnetic field is not zero.
Electric current is the flow of free electrons in the conductor. At any instant, the number of electrons leaving the wire is always equal to the number of electrons flowing from the battery into it. Hence, the net charge on the wire is zero.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
Assertion : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased.
Reason : Strength of a magnetic field at a point near the conductor increases on increasing the current.
- a)Assertion (A) is false but reason (R) is true.
- 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)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- 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 : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased.
Reason : Strength of a magnetic field at a point near the conductor increases on increasing the current.
a)
Assertion (A) is false but reason (R) is true.
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)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
e)
Both Assertion and Reason are false.
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Vikram Kapoor answered |
Assertion : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased. This statement is false. As Deflection of compass increases when current is increased.
Reason : Strength of a magnetic field at a point near the conductor increases on increasing the current. This statement is True.
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 two bulbs are operated on the same voltage supply, having power 60 W and 100 W then 100 W bulb has less resistance than 60 W.Reason: The power of the bulb is directly proportional to the square of the voltage.- 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 two bulbs are operated on the same voltage supply, having power 60 W and 100 W then 100 W bulb has less resistance than 60 W.
Reason: The power of the bulb is directly proportional to the square of the voltage.
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 |
According to Ohm’s Law, the resistance of an electric device can be calculated by dividing its voltage by the amount of electric current assumed.
If the voltage of two bulbs is assumed to be the same, the resistance of the bulbs equals to V/100 and V/60 respectively.
Thus, it is proved that the 60W bulb has higher resistance than the 100W bulb.
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 magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor.Reason : The magnetic field B produced by a straight current carrying wire is inversely proportional to the distance from the wire.- 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 magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor.
Reason : The magnetic field B produced by a straight current carrying wire is inversely proportional to the distance from the wire.
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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Krishna Iyer answered |
The magnitude of magnetic field is
1. directly proportional to the current I passing through the wire.
2. Inversely proportional to the distance r from the wire.
The magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor.
Due to overloading, the current in circuit becomes- a)Less
- b)More
- c)Zero
- d)Not definite
Correct answer is option 'B'. Can you explain this answer?
Due to overloading, the current in circuit becomes
a)
Less
b)
More
c)
Zero
d)
Not definite
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Swara Nambiar answered |
Explanation:
When a circuit is overloaded, it means that the current flowing through it exceeds its rated capacity. This can happen when too many devices are connected to a circuit that cannot handle the load.
Effects of Overloading:
1. Increased Current: When a circuit is overloaded, the current flowing through it increases. This is because the devices connected to the circuit draw more current than the circuit is designed to handle.
2. Heat Generation: The increased current leads to increased heat generation in the circuit components, such as wires, switches, and connectors. This can cause damage to the components and increase the risk of fire.
3. Voltage Drop: Overloading can also lead to a voltage drop in the circuit. This means that the voltage supplied to the devices connected to the circuit decreases, which can affect their performance.
Effect on Current:
The correct answer to the given question is option 'B' - More. When a circuit is overloaded, the current flowing through it increases. This is because the devices connected to the circuit draw more current than the circuit can provide.
Reason:
The reason behind the increase in current is Ohm's Law, which states that the current flowing through a circuit is directly proportional to the voltage and inversely proportional to the resistance. When the voltage supplied to the circuit remains constant and the resistance of the circuit remains the same, an increase in current can only occur if the devices connected to the circuit draw more current.
Therefore, when a circuit is overloaded, the current flowing through it becomes more than the rated capacity of the circuit. This can lead to overheating, voltage drop, and damage to the circuit components. It is important to avoid overloading circuits to ensure their safe and efficient operation.
When a circuit is overloaded, it means that the current flowing through it exceeds its rated capacity. This can happen when too many devices are connected to a circuit that cannot handle the load.
Effects of Overloading:
1. Increased Current: When a circuit is overloaded, the current flowing through it increases. This is because the devices connected to the circuit draw more current than the circuit is designed to handle.
2. Heat Generation: The increased current leads to increased heat generation in the circuit components, such as wires, switches, and connectors. This can cause damage to the components and increase the risk of fire.
3. Voltage Drop: Overloading can also lead to a voltage drop in the circuit. This means that the voltage supplied to the devices connected to the circuit decreases, which can affect their performance.
Effect on Current:
The correct answer to the given question is option 'B' - More. When a circuit is overloaded, the current flowing through it increases. This is because the devices connected to the circuit draw more current than the circuit can provide.
Reason:
The reason behind the increase in current is Ohm's Law, which states that the current flowing through a circuit is directly proportional to the voltage and inversely proportional to the resistance. When the voltage supplied to the circuit remains constant and the resistance of the circuit remains the same, an increase in current can only occur if the devices connected to the circuit draw more current.
Therefore, when a circuit is overloaded, the current flowing through it becomes more than the rated capacity of the circuit. This can lead to overheating, voltage drop, and damage to the circuit components. It is important to avoid overloading circuits to ensure their safe and efficient operation.
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