Answer :

In the given figure, when electric current through first coil changes then due to change in magnetic field lines, there will be an EMF (electromotive force) induced in the another coil. When the key is inserted in the circuit and when it is removed, the magnetic field lines will be first increase and then decreases. So, the current will be in opposite directions in the two cases, therefore, there are momentary galvanometer deflections in opposite directions.

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