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  • In the arrangement shown in Figure 13.4 there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then (a) the deflection in the galvanometer remains zero throughout

In the arrangement shown in Figure 13.4, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then
(a) the deflection in the galvanometer remains zero throughout
(b) there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed
(c) there are momentary galvanometer deflections that die out shortly; the deflections are in the same direction
(d) there are momentary galvanometer deflections that die out  shortly; the deflections are in opposite directions
 

Answers (1)

Hence, the correct answer is option (d).
Explanation:-

 Changing magnetic field can cause current in any loop. We know magnetic field can be created by current carrying wire. Therefore, we can see that changing current in one Loop can cause the current in another loop.
- This effect is known as a mutual electromagnetic inductive effect. As the key is inserted, the current becomes non-0 from zero which will cause a current in second loop.

- When key is removed later the current becomes zero from non-0, which will again cause current in the second loop.
The direction of current in second loop will be opposed in both cases as suggested by Flemings right-hand rule

 

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