Answer:
(d)
In the above arrangement, whenever an electric current through the first coil
is changed, an emf is induced in the coil due to change in magnetic field lines
which pass through the neighboring second coil.
When key is inserted and removed, then the magnetic field lines passes
through second coil increases and decreases in two cases respectively.
Therefore, the direction of current in two cases is in opposite directions.
Thus the galvanometer shows momentary deflections in opposite directions.
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