A coil of wire with ends A and B is connected to a galvanometer and a strong bar magnet is placed with its north pole towards end B of the coil. What happens to the galvanometer pointer when the south pole of the magnet is moved towards the end B of the coil?

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The pointer moves 90^o to the left.

The pointer deflects in the opposite direction.

The pointer points to zero.

The pointer moves 90^o to the right.

answer is C.

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Detailed Solution

The galvanometer pointer deflects in the opposite direction.

Given that the coil of wire with ends A and B is connected to a galvanometer and a strong bar magnet is placed with its north pole towards end B of the coil. Let's say the galvanometer needle deflects to the left. Then, the presence of the south pole of the magnet towards the end B of the coil shows the deflection of the pointer to right. Similarly, if the pointer deflected to right for the north pole, it deflects to the left for the south pole presence.

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