An 820-turn wire coil of resistance 24.0 Ω is placed on top of a
12 500-turn, 7.00-cm-long solenoid, as in Figure P20.57. Both
coil and solenoid have cross-sectional areas of 1.00 x 10-4 m2.
(a) How long does it take the solenoid current to reach 0.632
times its maximum value? (b) Determine the average back emf
caused by the self-inductance of the solenoid during this interval.
The magnetic field produced by the solenoid at the location
of the coil is one-half as strong as the field at the center
of the solenoid. (c) Determine the average rate of change in
magnetic flux through each turn of the coil during the stated
interval. (d) Find the magnitude of the average induced current
in the coil.
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