Answer: fewer than.
- A fewer than
- B more than
- C equal to
- D exactly double
Correct answer: A. fewer than
Explanation: A step-down transformer has fewer secondary turns, giving a lower output voltage.
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.