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Question
The emf induced in a coil that is rotating in a magnetic field will be at a maximum when
  1. the magnetic flux is at a maximum.
  2. the magnetic flux is at a minimum.
  3. the change in magnetic flux is at a maximum.
  4. the change in magnetic flux is at a minimum.
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Final Answer

(c)

Solution Video

OpenStax College Physics for AP® Courses Solution, Chapter 23, Problem 3 (Test Prep for AP® Courses) (0:32)

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Video Transcript

This is College Physics Answers with Shaun Dychko. The <i>emf</i> induced in a coil is the number of turns in a coil times the rate of change of the magnetic flux through it. And there's a negative sign to say that the, you know, Lenz's Law, the <i>emf</i> is in the opposite direction to oppose this change. But any case, what's important here is that the magnitude of the induced <i>emf</i> is at the maximum when the rate of change of the magnetic flux is at a maximum. So that's why the answer is C.