Answer: produce heat in the conducting material.
- A produce heat in the conducting material
- B increase the resistance of the coil
- C reduce the magnetic flux
- D prevent electromagnetic induction
Correct answer: A. produce heat in the conducting material
Explanation: Eddy currents induced in the conducting material produce Joule heating, which is used for melting metals in an induction furnace.
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.