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A coil of 40 turns is wrapped around a long solenoid of cross-sectional area 7.5*10^-3. The...

A coil of 40 turns is wrapped around a long solenoid of cross-sectional area 7.5*10^-3. The solenoid is 0.50 m long and has 500 turns. The current in the solenoid is given by the function: I(t)=3t-5(A). (a) What is the induced emf in the coil? (b) The outer coil is replaced by a coil of 40 turns whose radius is three times that of the solenoid. What is the induced emf in this coil?

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