Question

When the north pole of a magnet is kept vertically on a table, then

• A. one null point on the South of the magnet is formed
• B. one null point on the North of the magnet is formed
• C. two null points on either sides of North and South of the magnet are formed
• D. two null points on either sides of East and West of the magnet are formed

Answer 1

The correct option is C two null points on either sides of North and South of the magnet are formed

In the figure, we can see that at some points the magnetic field lines are opposite and almost equal in direction hence the resultant field is very weak and net magnetic field lines are very far from each other, but there are two points, one each on either side of magnet, where the magnetic field lines cancel out each other and the net field is zero, hence there are two null points on either sides of the North and South of the magnet