An 820-turn wire coil of resistance 24.0 Ω is placed around a 12 500-turn solenoid 7.00 cm long, as shown in Figure P32.68. 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 63.2% of its maximum value? Determine
(b) The average back emf caused by the self-inductance of the solenoid during this time interval,
(c) The average rate of change in magnetic flux through the coil during this time interval, and
(d) The magnitude of the average induced current in the coil.

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14.0 Ω 12 500 turns 24.0 Ω 820 turns 60,0 V