Answer: Angular velocity of coil rotation.
- A Strength of magnetic field
- B Number of turns
- C Angular velocity of coil rotation
- D All of above
Correct answer: C. Angular velocity of coil rotation
Explanation: Frequency f = omega/(2 pi) where omega is angular velocity of rotation. f depends on rotation speed.
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.