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 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

Answer 1

Using the right-hand rule-2, the magnetic field lines generated from a current in a loop point from B to A, indicating that the north pole of the resultant magnet is on the face closer to point A, regardless of the strength of the current.

Step-by-step explanation:

To determine the polarity of the face of a magnetic field created by a current in a loop, we utilize the right-hand rule-2 (RHR-2).

According to this rule, if you point your thumb in the direction of the current, your fingers will curl in the direction of the magnetic field. W

ith the current viewed from points A and B as anticlockwise and clockwise, respectively, this implies the magnetic field lines point from B to A, similar to that of a bar magnet with the north pole facing point A.

Therefore, regardless of the current magnitude, the north pole will always be on the face closest to point A.