In Figures (a) and (b), two $$air-cored$$ solenoids P and Q have been shown. They are placed near each other. In Figure (a), when IP, 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 $$2A$$ $$s-1$$ is fed through Q as shown in the figure. What emf will be induced in P?

Question

In Figures (a) and (b), two $$air-cored$$ solenoids P and Q have been shown. They are placed near each other. In Figure (a), when IP, 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  $$2A$$ $$s-1$$ is fed through Q as shown in the figure. What emf will be induced in P?

Infinity Learn · Accepted Answer

For first case: $$2mV=M$$×$$5For$$ second case: ε$$=M$$×$$2Solve$$ to get ε$$=0.8mV=8$$×$$10$$−$$4V$$

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