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Q.

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?

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a

8×10−4V

b

2×10−3V

c

5×10−3V

d

8×10−2V

answer is A.

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Detailed Solution

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

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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?