Physics-
General
Easy
Question
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 
flows in P (as seen by E) and an induced current 
flows in Q. The switch remains closed for a long time. When S is opened, a current 
flows in Q. Then the directions of and (as seen by E) are
- Respectively clockwise and anticlockwise
- Both clockwise
- Both anticlockwise
- Respectively anticlockwise and clockwise
The correct answer is: Respectively anticlockwise and clockwise
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. will flow in such a direction so that the magnetic field lines due to passes from left to right through Q. This is possible when flows in anticlockwise direction as seen by E. Opposite is the case when switch S is opened i.e. will be clockwise as seen by E.
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