A bar magnet induces a current in an N-turn coil as the magnet moves closer to...
A bar magnet induces a current in an N-turn coil as the
magnet moves closer to it as shown in (Figure 1) . The coil's
radius is R m, and the average induced emf across the bulb
during the time interval is ? V. 
A. Find the rate of change of magnetic field
Express your answer in terms of the variables ?, N, R, and appropriate constants.
Part B
Determine the induced current. Assume that R0 is the resistance of the coil.
Express your answer in terms of some or all of the variables ?, N, R, R0.
Part C
Is the direction of the induced current from lead a to b, or from b to a?
Homework Answers
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A bar magnet induces a current in an N-turn coil as the
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