Answer: 100 V.
- A 100 V
- B 50 V
- C 20 V
- D 200 V
Correct answer: A. 100 V
Explanation: Peak emf = NωΦ<sub>0</sub> = 50 × 100 × 0.02 = 100 V.
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.