Chapter 6: Electromagnetic Induction MCQs | physics Class 12 CBSE

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Question 1

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The SI unit of magnetic flux is:

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Question 2

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According to Faraday's law, the induced emf in a coil is equal to:

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Question 3

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In Faraday's Experiment 6.1, no deflection is observed in the galvanometer when:

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Question 4

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The magnetic flux through a plane surface of area A in a uniform magnetic field B, when the field makes an angle θ with the area vector, is:

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Question 5

Objective

The negative sign in the expression ε = −N(dΦB/dt) represents:

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Question 6

Objective

A rectangular loop is moving out of a uniform magnetic field region with constant velocity. The induced emf across the loop is:

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Question 7

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The motional emf induced in a conductor of length l moving with velocity v perpendicular to a magnetic field B is:

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Question 8

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The number of spokes in a wheel rotating in a magnetic field is doubled. The induced emf between the axle and the rim:

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Question 9

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The self-inductance of a long solenoid of n turns per unit length, area A, and length l is:

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Question 10

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When the core of a solenoid is replaced by a material of relative permeability μr, the self-inductance:

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Question 11

Objective

The energy stored in an inductor of self-inductance L carrying current I is:

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Question 12

Objective

The SI unit of self-inductance (henry) is equivalent to:

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Question 13

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For two coaxial solenoids, the mutual inductance M12 and M21 are related as:

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Question 14

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The induced emf in coil 1 due to a changing current I2 in neighbouring coil 2 with mutual inductance M is:

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Question 15

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The mutual inductance of two concentric circular coils of radii r1 (small) and r2 (large), with r1 << r2, is:

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Question 16

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In an AC generator, the induced emf is maximum when:

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Question 17

Objective

The peak emf produced by an AC generator with N turns, area A, rotating at angular speed ω in field B is:

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Question 18

Objective

In India, the frequency of rotation of AC generators is standardised at:

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Question 19

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The magnetic energy density (energy per unit volume) in a region with magnetic field B is:

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Question 20

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The self-induced emf is also called 'back emf' because:

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Chapter 6: Electromagnetic Induction | MCQs

The SI unit of magnetic flux is:

According to Faraday's law, the induced emf in a coil is equal to:

In Faraday's Experiment 6.1, no deflection is observed in the galvanometer when:

The magnetic flux through a plane surface of area A in a uniform magnetic field B, when the field makes an angle θ with the area vector, is:

The negative sign in the expression ε = −N(dΦB/dt) represents:

A rectangular loop is moving out of a uniform magnetic field region with constant velocity. The induced emf across the loop is:

The motional emf induced in a conductor of length l moving with velocity v perpendicular to a magnetic field B is:

The number of spokes in a wheel rotating in a magnetic field is doubled. The induced emf between the axle and the rim:

The self-inductance of a long solenoid of n turns per unit length, area A, and length l is:

When the core of a solenoid is replaced by a material of relative permeability μr, the self-inductance:

The energy stored in an inductor of self-inductance L carrying current I is:

The SI unit of self-inductance (henry) is equivalent to:

For two coaxial solenoids, the mutual inductance M12 and M21 are related as:

The induced emf in coil 1 due to a changing current I2 in neighbouring coil 2 with mutual inductance M is:

The mutual inductance of two concentric circular coils of radii r1 (small) and r2 (large), with r1 << r2, is:

In an AC generator, the induced emf is maximum when:

The peak emf produced by an AC generator with N turns, area A, rotating at angular speed ω in field B is:

In India, the frequency of rotation of AC generators is standardised at:

The magnetic energy density (energy per unit volume) in a region with magnetic field B is:

The self-induced emf is also called 'back emf' because:

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