Exam-style question
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What is the effect of a changing magnetic field on a coil according to Faraday's law?.
- A.It induces a constant current.
- B.It induces an emf.
- C.It decreases the magnetic flux.
- D.It has no effect on the coil.
Model answer
What a good answer should say
- It induces an emf.
Explanation
Why this works
According to Faraday's law, a changing magnetic field through a coil induces an electromotive force (emf). This principle is fundamental in electromagnetic induction and is the basis for how generators work.
Common mistake
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