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Electromagnetic Induction

19 free MDCAT Physics MCQs on Electromagnetic Induction (PM&DC syllabus), each with the answer, an explanation and the textbook line it comes from. Tap to check, no sign-up.

MDCAT (Pakistan)PhysicsPre-medical (Grade 12)19 questions

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  1. Question 1

    The phenomenon in which a changing current in a coil induces an emf in that same coil is called:

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    Answer: D) Self-induction

    The induced emf is proportional to the rate of change of current. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 113.

  2. Question 2

    The production of an emf in a neighbouring coil by a changing current in a nearby coil is:

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    Answer: A) Mutual induction

    emf2 = -M (Delta I1 / Delta t). Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 113.

  3. Question 3

    The ratio of the emf induced in a coil to the time rate of change of current through it is the coil's:

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    Answer: B) Self-inductance

    L = emf / (Delta I / Delta t). Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 113.

  4. Question 4

    Heinrich Lenz discovered that the polarity of induced emf always opposes the change producing it, in:

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    Answer: C) 1834

    Lenz was a Russian physicist. Source: 11 Physics Book FBISE, p. 238.

  5. Question 5

    Around 1906, the first seismometer based on Faraday's law of electromagnetic induction was created by:

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    Answer: D) Gallitzin

    Ground vibration moves a coil relative to a magnet. Source: 11 Physics Book FBISE, p. 240.

  6. Question 6

    Because it opposes the change producing it, the self-induced emf in a coil is sometimes called:

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    Answer: C) Back emf

    This is in accordance with Lenz's law. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 113.

  7. Question 7

    Because of their self-inductance, coils used in circuits are also known as inductors or a:

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    Answer: D) Choke

    A choke offers high reactance to higher frequencies. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 113.

  8. Question 8

    A 50-turn coil (50 ohm) in series with a 100 ohm galvanometer has its flux changed from 2 mWb to 4 mWb in 0.1 s. The average induced current is:

    Show answer and explanation

    Answer: A) 6.67 mA

    emf = 50 x 2 x 10^-3 / 0.1 = 1 V; I = 1/150 A = 6.67 mA. Source: 11 Physics Book FBISE, p. 240.

  9. Question 9

    A 25-turn square coil of side 1.80 cm lies perpendicular to a field rising uniformly from zero to 0.50 T in 0.80 s. The induced emf is:

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    Answer: C) 5.06 x 10^-3 V

    emf = 25 x (0.018)^2 x 0.50/0.80 = 5.06 x 10^-3 V. Source: 11 Physics Book FBISE, p. 245.

  10. Question 10

    An emf of 5.06 x 10^-3 V is induced in a coil of total resistance 0.350 ohm. The induced current is:

    Show answer and explanation

    Answer: D) 1.45 x 10^-2 A

    I = emf/R = 5.06 x 10^-3 / 0.350 = 1.45 x 10^-2 A. Source: 11 Physics Book FBISE, p. 245.

  11. Question 11

    A circular loop of radius 2 cm lies with its plane at 40 degrees to a uniform 0.2 T field. The flux through it is about:

    Show answer and explanation

    Answer: A) 1.62 x 10^-4 Wb

    Flux = B A sin 40 = 0.2 x pi x (0.02)^2 x 0.643 = 1.62 x 10^-4 Wb. Source: 11 Physics Book FBISE, p. 244.

  12. Question 12

    Inducing an emf in a secondary coil by varying the current in a nearby primary coil is the basic principle of a:

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    Answer: B) Transformer

    The changing primary current changes the flux through the secondary. Source: 11 Physics Book FBISE, p. 237.

  13. Question 13

    The emf induced in a coil is independent of the circuit's:

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    Answer: C) Resistance

    The induced current, I = emf/R, does depend on the resistance. Source: 11 Physics Book FBISE, p. 238.

  14. Question 14

    If the magnetic flux through an open (broken) coil changes, then:

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    Answer: D) An emf is induced but no current flows

    Current needs a closed circuit; the emf does not. Source: 11 Physics Book FBISE, p. 238.

  15. Question 15

    The induced emf in a coil can be increased by increasing its:

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    Answer: A) Number of turns

    A stronger field, larger area and faster motion also increase it. Source: 11 Physics Book FBISE, p. 238.

  16. Question 16

    Lenz's law is in accordance with the law of conservation of:

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    Answer: B) Energy

    Mechanical work done against the opposition becomes electrical energy. Source: 11 Physics Book FBISE, p. 239.

  17. Question 17

    When the N-pole of a magnet is pushed towards a coil, the end of the coil facing the magnet becomes a(n):

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    Answer: C) N-pole

    It repels the approaching magnet, opposing the increase in flux. Source: 11 Physics Book FBISE, p. 238.

  18. Question 18

    In Fleming's right-hand rule, the forefinger points along the field and the thumb along the motion; the middle finger then gives the:

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    Answer: D) Induced current

    Used for generators; the left-hand rule is for motors. Source: 11 Physics Book FBISE, p. 240.

  19. Question 19

    Mutual inductance between two coils is measured in:

    Show answer and explanation

    Answer: C) Henry

    1 H when 1 A/s in one coil induces 1 V in the other. Source: 12 Physics Book FBISE (MaryamNotes.pk), p. 114.

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