Answer: 6.28 V.
- A pi V
- B 2pi V
- C 6.28 V
- D 62.8 V
Correct answer: C. 6.28 V
Explanation: omega = 600/60 x 2pi = 20pi rad/s. E<sub>0</sub> = NBAomega = 100 x 0.1 x 0.01 x 20pi = 2pi = 6.28 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.