Electromagnetic Induction and Alternating Current 7 Question 11

11. As shown in the figure, P and Q are two coaxil 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 direction IQ1 and IQ2 (as seen by E ) are (2002,2M)

(a) respectively clockwise and anti-clockwise

(b) both clockwise

(c) both anti-clockwise

(d) respectively anti-clockwise and clockwise

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Answer:

Correct Answer: 11. (d)

Solution:

  1. When switch S is closed magnetic field lines passing through Q increases in the direction from right to left. So, according to Lenz’s law, induced current in Q i.e. IQ1 will flow in such a direction, so that the magnetic field lines due to IQ1 passes from left to right through Q.

This is possible when IO1 flows in anti-clockwise direction as seen by E. Opposite is the case when switch S is opened i.e. IQ2 will be clockwise as seen by E.



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