The number of neutral points around a bar magnet placed in the Earth's magnetic field, with its north pole pointing towards the geographic north, is :
- A2
- B4
- C6
- D5
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (a) 2
Explanation
A neutral point is where the magnet's field exactly cancels the Earth's horizontal field, so a compass there points in no fixed direction.
With the magnet's north pole pointing north, there are two neutral points, on its equatorial line, one on each side (east and west). With the north pole pointing south, the two lie on its axis instead.