Question

When the $N$-pole of a bar magnet points towards the south and $S$-pole towards the north, the null points are at the

• A. perpendicular divider of magnetic axis
• B. magnetic center
• C. $N$ and $S$ poles
• D. magnetic axis

Answer 1

The correct option is D

magnetic axis

Explanation

When the N-pole of a bar magnet points towards the south pole and S-pole towards the north, the null points (zero net field) are at the magnetic axis of the magnet as the field of earth and magnet are in opposite directions at this axis, hence may cancel each other.

IMAGE

$B_E=$ earth′s magnetic field,

$B_M=$ magnet′s field

Hence, correct option is (a).