Answer: induces.
- A induces
- B destroys
- C stores
- D permanently reverses
Correct answer: A. induces
Explanation: The changing flux as the magnet approaches induces an EMF in the coil.
As a magnet approaches a coil, flux rises steadily and a constant non-zero EMF is induced (Faraday's law). Once the magnet stops moving, flux stays constant and the induced EMF drops to zero - EMF only exists while flux is actively changing.
Concept context
Faraday's and Lenz's laws, motional EMF, self/mutual inductance, eddy currents, and the AC generator - how a changing magnetic flux creates an electric current.