A magnet moves inside a coil. Consider the following factors: I) Strength of the magnet II) Number of turns in the coil III) Speed at which the magnet moves Which can affect the emf induced in the coil?
Correct answer: C. I, II, III
- A. I only
- B. III only
- C. I, II, III
- D. I and II only
Explanation
The induced current and induced emf can be increased by: I. Using a strong magnetic field. II. Moving the loop faster. III. Replacing the loop by a coil of many turns.
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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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