A coil of constant area is placed in a constant magnetic field, an induced current is produced in the coil when:
Correct answer: A. The coil is rotated
- A. The coil is rotated
- B. The coil is stationary
- C. Both (a) and (b)
- D. None of these
Explanation
When the coil is rotated in the magnetic field, the area enclosed by the coil's loops changes orientation relative to the field lines. This results in a change in magnetic flux through the coil, inducing an emf and subsequently a current to oppose the change (according to Lenz's law).
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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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