1.

As shown in the figure, P and Q are two coaxial conducting loops separated by some distance. When the switch S is closed, a clockwise current IP flows in P (as seen by E) and an induced current IQ1 flows in Q. The switch remains closed for a long time. When S is opened, a current IQ2 flows in Q. Then the directions of IQ1 and IQ2 (as seen by E) are(a) respectively clockwise and anticlockwise (b) both clockwise (c) both anticlockwise (d) respectively anticlockwise and clockwise

Answer»

Correct Answer is: (d) respectively anticlockwise and clockwise

When S is closed, the clockwise current IP flowing through P produces a magnetic field B directed from E to Q to P. This field B, by Lenz’s law, causes an anticlockwise current IQ1 in Q. When S is opened, B decreases. This induces a clockwise current IQ2 in Q.



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