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  • 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 anticlockwise and clockwise respectively. The magnet

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 anticlockwise 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) A
(b) B
(c) A if the current is small, and B if the current is large
(d) B if the current is small and A if the current is large

 

Answers (1)

Hence, the correct answer is (a).
Explanation:-
The magnetic field lines form a close loop, but if we see any magnet then the magnetic field lines seem to originate from the North Pole. Within the magnet, the magnetic field lines will be from South Pole to North Pole.
- As in this question, the magnetic field lines point from B to A. It means for the outside world it is coming out from A.
- Hence point A will be North Pole and point B will be South Pole.
- The nature of face whether it will be South Pole or fool North Pole depends on the sense of current in the loop. This nature does not depend on the magnitude of current.
 

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