Answer: 0.5 H.
- A 0.05 H
- B 0.5 H
- C 1 H
- D 2 H
Correct answer: B. 0.5 H
Explanation: L = NΦ/I = 100·0.01/2 = 0.5 H.
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.