# What is the induced e.m.f. (as a function of t) in the coil?

b) A 3-cm long solenoid has 800 turns and carries a current given by the function I(t) = (60 sin 200t) mA. The diameter of the solenoid is 3 cm.

Outside the solenoid and coaxial with it is a coil that has a radius of 3.5 cm and consists of a total of 700 turns of fine wire (Figure Q1(b)).

What is the induced e.m.f. (as a function of t) in the coil?

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