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Question 20227
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: Lenz's Law — Energy Conservation MCQ

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Lenz's Law — Energy ConservationMediumQuestion 20227

Question

A person pushing a magnet into a coil feels a resistance (back force). This is because:
  1. A
    The coil has mass
  2. B
    The induced current creates a field that opposes the motion (Lenz's law)
    Correct
  3. C
    Friction opposes the magnet
  4. D
    The coil is fixed

Correct answer

The induced current creates a field that opposes the motion (Lenz's law)

Explanation

Lenz's law ensures energy conservation: work done against the back force = electrical energy in the induced current. Without this opposition, pulling a magnet out could accelerate a coil and create energy from nothing.

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