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(a) Calculate the self-inductance of a s...

(a) Calculate the self-inductance of a solenoid that is tightly wound with wire of diameter `0.10 cm`, has a cross-sectional area `0.90 cm^2` and is `40 cm` long
(b) If the current through the solenoid decreases uniformly from `10` A to `0 A` in `0.10 s`, what is the emf induced between the ends of the solenoid?

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