Electromagnetic Induction NEET Questions with Solutions

Q: How many questions come from Electromagnetic Induction in NEET 2027?

You can expect 1 to 2 questions in NEET 2027. The chapter has high PYQ frequency. Faraday's law applications, motional EMF, Lenz's law direction, self-inductance and energy stored in an inductor are favourites.

Q: What is Faraday's law of induction?

Whenever the magnetic flux through a closed loop changes, an EMF is induced in the loop equal to minus the rate of change of flux. epsilon equals minus d Phi over dt. For N turns, multiply by N. The induced EMF drives a current if the loop is closed.

Q: What is Lenz's law?

The direction of the induced current is such that it OPPOSES the change in flux that produced it. This is the meaning of the negative sign in Faraday's law. Lenz's law follows from energy conservation: if the induced current aided the change, you could create energy out of nothing.

Q: What is motional EMF?

A conducting rod of length L moving with velocity v perpendicular to a magnetic field B (with v perpendicular to L) develops EMF epsilon equals B L v across its ends. This is induced EMF without any time-varying field; the change of flux comes from the rod sweeping out new area.

Q: What are eddy currents?

Currents induced in bulk pieces of conductor by a changing flux. They form swirling loops, hence the name. Eddy currents heat up the conductor, dissipating energy. They are useful in induction stoves and magnetic braking, and undesirable in transformer cores (laminations reduce them).

Q: What is self-inductance?

When the current through a coil changes, the changing flux through itself induces a back EMF. epsilon equals minus L di over dt. L is the self-inductance, in henries (H). For a long solenoid, L equals mu_0 N squared A over length.

Q: What is the energy stored in an inductor?

Building up current I from zero in an inductor requires work, which is stored in the magnetic field. U equals half L I squared. Energy density (in vacuum) is u equals B squared over (2 mu_0).

Question 1

The unit of magnetic flux is:

Accepted Answer

weber

Question 2

Faraday's law states that induced EMF equals:

Accepted Answer

[math]

Question 3

A 0.2 m rod moves at 5 m/s perpendicular to a 0.4 T field. EMF is:

Accepted Answer

0.4 V

Question 4

Unit of self-inductance:

Accepted Answer

henry

Question 5

Energy stored in an inductor of L = 0.2 H carrying I = 5 A:

Accepted Answer

2.5 J

Question 6

Lenz's law is a consequence of:

Accepted Answer

Conservation of energy

Question 7

Flux through a coil drops from 0.5 Wb to 0.1 Wb in 0.2 s. EMF induced:

Accepted Answer

2 V

Question 8

Mutual inductance M_12 and M_21 satisfy:

Accepted Answer

[math]

Question 9

Doubling N of a solenoid changes L by:

Accepted Answer

×4

Question 10

Energy density of a B field in vacuum is:

Accepted Answer

[math]

Question 11

A coil makes angle θ with B. Maximum flux when:

Accepted Answer

θ = 0° between B and area normal

Question 12

A magnet falls through a copper tube. It falls slower than free-fall because:

Accepted Answer

Eddy currents in tube oppose its motion

Question 13

A square loop of side [math] moves with velocity v perpendicular to one of its sides through a uniform B perpendicular to the loop. EMF induced when ALL of the loop is inside B:

Accepted Answer

Zero

Question 14

Inductance L of a solenoid with iron core (μ_r = 1000) compared to air-core:

Accepted Answer

×1000

Question 15

Inductor with L = 1 mH carries 4 A. Energy stored:

Accepted Answer

8 mJ

Question 16

A coil of 200 turns in a B = 0.5 T has area 0.01 m². The coil is rotated so that its plane changes from parallel to B to perpendicular in 0.1 s. Average EMF:

Accepted Answer

10 V

Question 17

A loop is moved out of a uniform B (perpendicular to the loop). The induced current direction is such that the magnetic force on the loop:

Accepted Answer

Opposes the motion

Question 18

Mutual inductance of two coaxial coils: how does it depend on the geometry?

Accepted Answer

Number of turns and shared area

Question 19

Power dissipated in the resistor of a moving rod (mass m, R, B, L) at terminal velocity (gravity provides the force):

Accepted Answer

[math]

Question 20

To reduce eddy current losses in a transformer core:

Accepted Answer

Use thin laminations insulated from each other

Question 21

Voltage across a 0.5 H inductor when current changes at 4 A/s:

Accepted Answer

2 V

Question 22

If L doubles and I halves, U becomes:

Accepted Answer

×0.5

Question 23

A coil rotates at 60 Hz in a 0.1 T field with area 0.01 m². Maximum induced EMF:

Accepted Answer

[math] V

Question 24

A coil of L = 0.4 H has current changing from 5 A to 1 A in 0.2 s. Magnitude of EMF:

Accepted Answer

8 V

Question 25

A change of 5 A/s in coil A induces 2 V in coil B. Mutual inductance:

Accepted Answer

0.4 H

Question 26

A 50-turn coil of 0.01 m² area in a 0.4 T field perpendicular to it. Flux linkage:

Accepted Answer

0.2 Wb

Question 27

A bar magnet's S pole approaches a coil from the right. Induced current viewed from the right:

Accepted Answer

Clockwise

Question 28

A wing of length 30 m on an aeroplane flies at 720 km/h horizontally where vertical B = 4 × 10⁻⁵ T. EMF across wing:

Accepted Answer

0.24 V

Question 29

To double the energy stored in an inductor at fixed L, current must:

Accepted Answer

Increase by sqrt(2)

Question 30

Eddy currents are reduced by:

Accepted Answer

Laminating the core

Question 31

Air-core solenoid: L = 5 mH. With iron core (μ_r = 200) but same dimensions:

Accepted Answer

1 H

Question 32

Two coils with [math] mH, [math] mH, [math] mH. Coupling coefficient k:

Accepted Answer

5/6

Electromagnetic InductionNEET Physics · Class 12 · NCERT Chapter 6

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Electromagnetic InductionNEET Physics · Class 12 · NCERT Chapter 6

1NEET 2018EasyThe unit of magnetic flux is:

2NEET 2020EasyFaraday's law states that induced EMF equals:

3NEET 2022MediumA 0.2 m rod moves at 5 m/s perpendicular to a 0.4 T field. EMF is:

4NEET 2024MediumUnit of self-inductance:

5NEET 2017MediumEnergy stored in an inductor of L = 0.2 H carrying I = 5 A:

6NEET 2019MediumLenz's law is a consequence of:

7NEET 2021MediumFlux through a coil drops from 0.5 Wb to 0.1 Wb in 0.2 s. EMF induced:

8NEET 2023MediumMutual inductance M_12 and M_21 satisfy:

9NEET 2018MediumDoubling N of a solenoid changes L by:

10NEET 2020MediumEnergy density of a B field in vacuum is:

11NEET 2022MediumA coil makes angle θ with B. Maximum flux when:

12NEET 2024MediumA magnet falls through a copper tube. It falls slower than free-fall because:

13NEET 2017MediumA square loop of side a moves with velocity v perpendicular to one of its sides through a uniform B perpendicular to the loop. EMF induced when ALL of the loop is inside B:

14NEET 2019MediumInductance L of a solenoid with iron core (μ_r = 1000) compared to air-core:

15NEET 2021MediumInductor with L = 1 mH carries 4 A. Energy stored:

16NEET 2023MediumA coil of 200 turns in a B = 0.5 T has area 0.01 m². The coil is rotated so that its plane changes from parallel to B to perpendicular in 0.1 s. Average EMF:

17NEET 2018MediumA loop is moved out of a uniform B (perpendicular to the loop). The induced current direction is such that the magnetic force on the loop:

18NEET 2020MediumMutual inductance of two coaxial coils: how does it depend on the geometry?

19NEET 2022MediumPower dissipated in the resistor of a moving rod (mass m, R, B, L) at terminal velocity (gravity provides the force):

20NEET 2024EasyTo reduce eddy current losses in a transformer core:

21NEET 2017MediumVoltage across a 0.5 H inductor when current changes at 4 A/s:

22NEET 2019MediumIf L doubles and I halves, U becomes:

23NEET 2021MediumA coil rotates at 60 Hz in a 0.1 T field with area 0.01 m². Maximum induced EMF:

24NEET 2023MediumA coil of L = 0.4 H has current changing from 5 A to 1 A in 0.2 s. Magnitude of EMF:

25NEET 2018MediumA change of 5 A/s in coil A induces 2 V in coil B. Mutual inductance:

26NEET 2020MediumA 50-turn coil of 0.01 m² area in a 0.4 T field perpendicular to it. Flux linkage:

27NEET 2022MediumA bar magnet's S pole approaches a coil from the right. Induced current viewed from the right:

28NEET 2024MediumA wing of length 30 m on an aeroplane flies at 720 km/h horizontally where vertical B = 4 × 10⁻⁵ T. EMF across wing:

29NEET 2017MediumTo double the energy stored in an inductor at fixed L, current must:

30NEET 2019EasyEddy currents are reduced by:

31NEET 2021MediumAir-core solenoid: L = 5 mH. With iron core (μ_r = 200) but same dimensions:

32NEET 2023MediumTwo coils with L1​=4 mH, L2​=9 mH, M=5 mH. Coupling coefficient k:

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