When a motor rotates emf is induced. This induced emf is in such a direction that:
Correct answer: B. Opposes the emf running the motor
- A. Helps the emf running the motor
- B. Opposes the emf running the motor
- C. Both (a) and (b)
- D. None of these
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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