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(B) The negative charge on the loop rotates in a clockwise direction. Since the current $I$ is defined as the flow of positive charge,the equivalent c

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the magnet rotates clockwise as seen from below.

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(B) The negative charge on the loop rotates in a clockwise direction. Since the current $I$ is defined as the flow of positive charge,the equivalent current $I$ flows in the counter-clockwise (anticlockwise) direction.Using the right-hand thumb rule,the magnetic field lines produced by this anticlockwise current loop emerge out of the plane of the paper at the center of the loop.This current loop behaves like a magnetic dipole with its North pole facing towards the observer (out of the plane) and its South pole facing away from the observer (into the plane).The small magnet placed above the loop has its North pole on the right and South pole on the left. The magnetic field produced by the loop interacts with the magnetic dipole of the small magnet.Due to the torque exerted by the magnetic field of the loop on the small magnet,the magnet will experience a force that causes it to rotate. Specifically,the interaction results in the magnet rotating in a clockwise direction when viewed from below.

$A$ negative charge is given to a nonconducting 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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