A solenoid has a diameter of 12cm when a current i exists, Ask an Expert

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a solenoid has a diameter of 12cm when a current i exists in its winding a uniform magnetic field of magnitude B = 30mT is produced in its interior. By decreasing i, the field is caused to decrease at the rate of 6.5 mT/s. Calculate the magnitude of the induced electric field

a) 2.2 cm and

b) 8.2 cm form the axis of the solenoid

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