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Question 20181
JEE Physics · Medium

Electromagnetic Induction and Alternating Current: AC Generator Principle MCQ

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AC Generator PrincipleMediumQuestion 20181

Question

In an AC generator, the coil rotates in a magnetic field. The EMF is maximum when:
  1. A
    The plane of the coil is perpendicular to B
  2. B
    The plane of the coil is parallel to B
    Correct
  3. C
    The coil velocity is zero
  4. D
    The coil is perpendicular to the flux

Correct answer

The plane of the coil is parallel to B

Explanation

EMF = NBA ω sinωt is maximum when sinωt = 1 → ωt = π/2. At this moment the plane of the coil is parallel to B (the coil's normal is perpendicular to B), so the coil is cutting field lines at the maximum rate.

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