Answer: BAomega sin(omega t).
- A BAomega
- B BAomega cos(omega t)
- C BAomega sin(omega t)
- D BA sin(omega t)
Correct answer: C. BAomega sin(omega t)
Explanation: Phi = BA cos(omega t). EMF = -d(phi)/dt = BA omega sin(omega t). Maximum EMF = BAomega.
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.