1.

Length of the bar magnet is aligned along the axis of a circular coil which is placed far away from the magnet. When magnet is moved along the axis of coil then looking from the side of the magnet, it is found that clockwise current flows through the coil. Which of the following is/are possible?

Answer»

South pole of the magnet faces the coil and is moved towards the coil
South pole of the magnet faces the coil and is moved away from the coil
North pole of the magnet faces the coil and is moved towards the coil
North pole of the magnet faces the coil and is moved away from the coil

Solution :We must be aware that clockwise CURRENT in the loop is EQUIVALENT to south pole and anticlockwise current is equivalent to north pole, When south pole of the magnet is moved towards the coil then current in the coil should oppose its motion. Hence clockwise current DEVELOPS from the side of the magnet to DEVELOP south pole to repel south pole of the approaching magnet. Hence, option (a) is correct.
When south pole of the mugnet is moved away from the coil then current in the coil should oppose its motion. Hence anticlockwise current develops from the side of the magnet to develop north pole to attract south pole of the receding magnet. Hence, option (b) is wrong.
When north pole of the magnet is moved towards the coil then current in the coil should oppose its motion. Hence anticlockwise current develops from the side of the magnet to develop north pole to repel north pole of the approaching magnet.Hence, option (C) is wrong.
When north pole of the magnet is moved away from the coil then current in the coil should oppose its motion. Hence clockwise current develops from the side of the magnet to develop north pole to attract south pole of the receding magnet. Hence, option (h) is wrong. Options (a) and (d) are correct.


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