A negative charge is given to a non-conductin | vedclass

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(B) When a negative charge rotates in a clockwise direction,it is equivalent to a positive current flowing in the anticlockwise direction.According to

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The magnet rotates clockwise as seen from below.

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(B) When a negative charge rotates in a clockwise direction,it is equivalent to a positive current flowing in the anticlockwise direction.According to the right-hand thumb rule,the magnetic field produced by this current loop will be directed out of the plane of the paper.This makes the ring act as a magnetic dipole with its North pole facing towards the observer (out of the plane).The small magnet placed above the ring has its South pole facing the ring's North pole.Since opposite poles attract,the South pole of the small magnet will be attracted towards the North pole of the equivalent magnetic dipole formed by the ring.As the ring rotates,the magnetic field distribution changes,causing a torque on the small magnet,which results in the magnet rotating in a clockwise direction when viewed from below.

$A$ negative charge is given to a non-conducting loop and the loop is rotated in the plane of paper about its centre as shown in the figure. The magnetic field produced by the ring affects a small magnet placed above the ring in the same plane.

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