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Test: Magnetic Effects of Electric Current - 2 - UPSC MCQ


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20 Questions MCQ Test Science & Technology for UPSC CSE - Test: Magnetic Effects of Electric Current - 2

Test: Magnetic Effects of Electric Current - 2 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Test: Magnetic Effects of Electric Current - 2 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Magnetic Effects of Electric Current - 2 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Magnetic Effects of Electric Current - 2 below.
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Test: Magnetic Effects of Electric Current - 2 - Question 1

The area around a magnet, in which its influence (force of attraction or repulsion) can be felt, is called its

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 1

The region around a magnet, in which its influence can be felt, is called its magnetic field

Test: Magnetic Effects of Electric Current - 2 - Question 2

Which device produces the electric current?

Test: Magnetic Effects of Electric Current - 2 - Question 3

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 :

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 3

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.

Test: Magnetic Effects of Electric Current - 2 - Question 4

What is that instrument which can detect the presence of electric current in a circuit?

Test: Magnetic Effects of Electric Current - 2 - Question 5

The direction of magnetic field developed around a current-carrying conductor can be easily found by the use of

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 5

The direction of magnetic field developed around a current-carrying conductor can be found by the use of right-hand thumb rule.

Test: Magnetic Effects of Electric Current - 2 - Question 6

Who has stated the Right hand Thumb Rule?

Test: Magnetic Effects of Electric Current - 2 - Question 7

The strength of the magnetic field around a current-carrying straight conductor

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 7

The strength of the magnetic field around a current-carrying straight conductor is directly proportional to the amount of current flowing in the conductor.

Test: Magnetic Effects of Electric Current - 2 - Question 8

What should be the core of an electromagnet?

Test: Magnetic Effects of Electric Current - 2 - Question 9

The strength of a magnetic field inside a long current-carrying straight solenoid coil is

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 9

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

Test: Magnetic Effects of Electric Current - 2 - Question 10

The most important safety method used for protecting home appliances from short circuiting or overloading is

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 10

It is most important method for protecting the electrical devices from short circuiting or overloading by stopping the flow of any large electric current exceeds from its rating.

Test: Magnetic Effects of Electric Current - 2 - Question 11

An electron moves with a speed v along positive direction of x-axis. If a magnetic field B acts along the positive y-direction, then the force on the electron will act along

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 11

Answer:

-ve  z axis

Explanation:

We use left hand rule or right hand palm rule or  cockscrew rule

as electron moves in positive x axis the current I is in -ve x axis

B is in +ve y axis

then -ve z axis is the direction of lorentz force

or u can just use vector cross product [-i x j ] = -k

Test: Magnetic Effects of Electric Current - 2 - Question 12

To convert an AC generator into DC generator

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 12

To connect AC generator into DC generator, split ring type commutation must be used to get a unidirectional direct current.

Test: Magnetic Effects of Electric Current - 2 - Question 13

The strength of magnetic field along the axis of a solenoid coil :

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 13

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.

Test: Magnetic Effects of Electric Current - 2 - Question 14

The strength of magnetic field inside a long current carrying straight solenoid is

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 14

A current carrying solenoid produces a uniform magnetic field inside it.

Test: Magnetic Effects of Electric Current - 2 - Question 15

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

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 15

When a current-carrying straight conductor is placed perpendicular to the direction of a uniform magnetic field, it experiences a mechanical force. The direction of mechanical force is given by Fleming’s left-hand rule.

Test: Magnetic Effects of Electric Current - 2 - Question 16

Commercial electric motors do not use

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 16

Using electromagnet, the magnetic field strength further increase by increasing the current. Hence it will enhance the power of electric.

Test: Magnetic Effects of Electric Current - 2 - Question 17

A uniform magnetic field exists in the plane of paper Electron Proton pointing from left to right as shown in the figure. In the field an electron and a proton move as shown. The electron and proton experience

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 17

On applying Fleming’s left-hand rule we find that both electron as well as proton experience forces pointing into the plane of paper.

Test: Magnetic Effects of Electric Current - 2 - Question 18

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

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 18

A solenoid behaves like a bar magnet. Hence the pattern of magnetic field associated with solenoid and around the bar magnet is same.

Test: Magnetic Effects of Electric Current - 2 - Question 19

Choose the wrong statement out of the following :

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 19

Like magnetic poles (say N- and N-poles) always repel each other.

Test: Magnetic Effects of Electric Current - 2 - Question 20

If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are

Detailed Solution for Test: Magnetic Effects of Electric Current - 2 - Question 20

Magnetic field lines around a straight current carrying conductor are in the form of concentric circle.

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