Question

A small valued resistance XY is connected across the ends of a coil. Predict the direction of induced current in the resistance XY when

i) South pole of a magnet moves toward end A of the coil.

ii) South pole of a magnet moves away from end A of the coil.

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Answer 1

I) As South Pole is brought towards the coil, end id induced in the coil such that it opposes the change that causes it, that is, it opposes the incoming motion of South Pole. Hence South Pole is induced in the coil such that it repels the incoming South Pole and goes in clockwise direction.

II) As south poleis brought away from the coil, end is induced in the coil such that it opposes the change that causes it, that is, it opposes the outgoing motion of South Pole. Hence north pole is induced in the coil such that it attracts the incoming south pole and goes in anticlockwise direction

Hope this helps you !

Answer 2

Answer:

(i) According to the Lenz’s Law induced emf will oppose the source of the charge, thus to oppose the approaching South Pole magnetic South Pole will be developed at the end of the magnet. Thus the current will flow in the clockwise direction as shown in the figure below.

(ii) According to the Lenz’s Law induced emf will oppose the source of the charge, thus to oppose the going away South Pole magnetic North Pole will be developed at the end of the magnet so that the south pole of the magnet do not go away. Thus the current will flow in the anticlockwise direction as shown in the figure below.