Question

Above figure shows a bar magnet placed on the table top with its north pole pointing towards south.
The arrow shows the north-south direction. There are no other magnets or magnetic material nearby.
(a) Insert two magnetic field lines on either side of the magnet using arrow head to show the direction of each field line.
(b) Indicate by crosses, the likely position of the neutral points.
(c) What is the magnitude of the magnetic field at each neutral point? Give a reason for your answer.

Answer 1

(a) The below figure (a) is as shown.
(b) The likely position of the neutral points are as shown in below figure (b).
(c) At neutral points, the magnitude of magnetic field is zero as at these points the magnetic field of the magnet is the same as the magnitude of the earth’s horizontal magnetic field, but is the opposite in direction thereby cancelling each other.