Answer: doubles.
- A halves
- B doubles
- C is unchanged
- D becomes four times
Correct answer: B. doubles
Explanation: Peak emf ∝ ω, so doubling ω doubles the peak emf.
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.