Q3Multiple choice
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)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
Show answer
(a) A
Hint: Hint— Misconception is that magnetic field lines point from north to south pole. The fact is that they emerge out of North pole and entre into South pole.