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A very long, straight solenoid with a diameter of 3.00 cm is wound with 40 turns...

A very long, straight solenoid with a diameter of 3.00 cm is wound with 40 turns of wire per centimeter, and the windings carry a current of  0.225 A. A second coil having N turns and a larger diameter is slipped over the solenoid so that the two are coaxial. The current in the solenoid is ramped down to zero over a period of 0.60 s.

a) What average emf is induced in the second coil if it has a diameter of 4.1 cm and N = 9? Answer in units of uV.

b) What is the induced emf if the diameter is 8.2 cm and N = 18? Answer in units of uV.

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