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In Fig (a) and (b), two air-cored soleno...

In Fig (a) and (b), two air-cored solenoids `P` and `Q` have been shows. They are placed near each other. In Fig (a), when `I_(P)`, the current in `P`, changes at the rate of `5 A s^(-1)`, an emf of `2 mV` is induced in `Q`. The current in `P` is then switched off, and the current changing at `2 A s^(-1)` is fed through `Q` as shows in the figure. What emf will be induced in `P`?

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