i need the answer for this question An 820-tum wire coil of resistance 24.0 Ohm

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i need the answer for this question

An 820-tum wire coil of resistance 24.0 Ohm is placed around a 12500-turn solenoid 7.00 cm long, as shown in the figure below. Both coil and solenoid have cross-sectional areas of 1.00x10-4 m2. How long does it take the solenoid current to reach 63.2% of its maximum value? Determine the average back emf caused by the self-inductance of the solenoid during this time interval. Determine the average rate of change in magnetic flux through the coil during this time interval. Determine the magnitude of the average induced current in the coil.

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