Question

For what orientation of south pole of a bar magnet the null points are on the axial line of it ?

• A. Pointing to South
• B. Pointing to North
• C. Pointing to East
• D. Pointing to West

Answer 1

The correct option is B Pointing to North

The geographical north of the earth coincides with the magnetic south. Along the axial line of the bar magnet, the magnetic force is directed from it's south pole to its north pole. Hence for the magnetic forces to cancel (null point), the direction of the bar magnet should be opposite to that of the earth's magnet and hence coincide with the geographical north and south