In the arrangement shown in Figure 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
The left coil is called primary coil and the right coil is called secondary coil.
When a key is plugged, the current changes in the primary coil, the changes current is associated with changing flux.
This changing flux induces an emf and hence current in secondary coil and therefore galvanometer shows deflection.
When the key is plugged out:
The current in the primary coil drops and again and emf is induced due to changing current.
This induced emf causes a current to flow and hence the galvanometer shows deflection.
Since the induced emf is opposite in both cases, i.e. when the key is plugged and unplugged the direction of current is opposite and hence galvanometer shows deflection in opposite direction. Option 4 : there is momentary galvanometer deflection that die out shortly; the deflections are in opposite dictions
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