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As shown in figure, P and Q are two co-a...

As shown in figure, P and Q are two co-axial conducting loops separated by some distance. When the switch S is closed, a clockwise current `I_(P)` flows in P (as seen by E) and an induced current `I_(Q_(1))` flows in Q. The switch remains closed for a long time. When S is opened, a current `I_(Q_(2))` flows in Q.
Then, the directions of `I_(Q_(1))` and `I_(Q_(2))` (as seen by E) are

A

respectively clockwise and anti-clockwise

B

both clockwise

C

both anti-clockwise

D

respectively anti-clockwise and clockwise

Text Solution

Verified by Experts

The correct Answer is:
D
When switch `S` is closed magnetic field passing through `Q` increases in the direction from right to left.So, according to Lenz's law induced current in `Q` i.e. `I_(Q)` will flow in such a direction so that the magnetic field lines due to `I_(Q2)` passes from left to right through `Q`.This is possible when `I_(Q1)` flows in anticlockwise direction as seen by `E`.Opposite is the case when switch `S` is opened i.e. `I_(Q2)` will be clockwise as seen by `E`.
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