Assume that a conductor being cut by the flux of an expanding magnetic field has 10 V induced with the top end positive. Now analyze the effect of the following changes:
(a) The magnetic flux continues to expand, but at a slower rate. How does this affect the amount of induced voltage and its polarity?
(b) The magnetic flux is constant, neither increasing nor decreasing. How much is the induced voltage?
(c) The magnetic flux contracts, cutting across the conductor with the opposite direction of motion. How does this affect the polarity of the induced voltage?