Faraday's law states that the induced emf in a circuit is proportional to
Correct answer: B. the rate of change of magnetic flux linkage
- A. the magnetic flux through it
- B. the rate of change of magnetic flux linkage
- C. the current in it
- D. the resistance of the circuit
Explanation
It is the rate of change that matters, not the flux itself, so a coil sitting in a strong but steady field has no emf induced in it at all. Moving the magnet faster, using more turns or using a stronger field all increase the rate of change and therefore the emf. This is the single most important idea in the chapter.
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About Faraday's Law
Faraday's law states that an induced electromotive force equals the rate of change of magnetic flux linkage through a circuit. Questions cover changing field, area, angle or motion, the negative sign associated with Lenz's law, and the distinction between induced emf and the current that may flow in a closed circuit.
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