A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key...........

Physics Chapter - 13

A circular loop placed in a plane perpendicular to the plane of paper carries a current when the key is on.

The current as seen from points A and B (in the plane of paper and on the axis of the coil) is anti-clockwise and clockwise, respectively.

The magnetic field lines point from B to A. The N-pole of the resultant magnet is on the face close to

A if the current is small and B if the current is large

B if the current is small and A if the current is large

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Explanation:

The N-pole of the resultant magnet is on the face close to A because, the magnetic field lines enter in loop from B and come out from A. Also, as a matter of fact magnetic lines come out of the N-pole of magnet. Therefore, face close to A represents N-pole. The currents in A and B are same.