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

Question

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 0.250 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 0.5 s.

Part A

What average emf is induced in the second coil if it has a diameter of 3.60 cm and N = 38?

Express your answer in microvolts to two significant figures.

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Part B

What is the induced emf if the diameter is 7.20 cm and N = 76?

Express your answer in volts to two significant figures.

Explanation / Answer

Emf = N.d/dt = N.B.dA/dt

Emf = N.A.dB/dt

what about the B valuue?

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