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Question 20187
JEE Physics · Hard

Electromagnetic Induction and Alternating Current: Rotating Coil EMF MCQ

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Rotating Coil EMFHardQuestion 20187

Question

A coil of N turns, area A rotates at angular frequency ω in field B. The maximum EMF is:
  1. A
    NBA/ω
  2. B
    NBAω
    Correct
  3. C
    NBA/ω²
  4. D
    N²BAω

Correct answer

NBAω

Explanation

EMF = −dΦ/dt = −d(NBA cosωt)/dt = NBAω sinωt. Maximum value = NBAω (at sinωt = 1).

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