Question

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 the 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

Answer 1

The answer is (a) A

• Direction of Magnetic field will be from south to northpole. 
• Point A is showing northpole because field lines are pointing from B to A.