Answer: 100pi V.
- A 100pi V
- B 200pi V
- C pi V
- D 50pi V
Correct answer: A. 100pi V
Explanation: E<sub>0</sub> = NBAomega = 200 x 0.5 x 0.01 x 2pi x 50 = 200 x 0.5 x 0.01 x 100pi = 100pi 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.