The phenomenon in which a change of current in one coil induces an emf in the other coil is called:
Correct answer: B. Mutual induction
- A. Self induction
- B. Mutual induction
- C. Electric induction
- D. None of above
Explanation
Mutual induction occurs when a changing current in one coil induces a voltage in another nearby coil. This happens because the changing magnetic field produced by the current in the first coil intersects with the turns of the second coil, generating an electromotive force (emf) according to Faraday's law. It's a fundamental principle in the functioning of transformers and is utilized in various applications involving wireless energy transfer and communication systems.
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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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