Chapter 12: Magnetic Effects of Electric Current

Magnetic field lines of a bar magnet emerge from the North Pole and terminate at the South Pole, as shown in the figure below.

The properties of magnetic field lines are as follows:

• • Magnetic field lines do not intersect with each other.
  • They emerge from the North Pole and terminate at the South Pole.
  • Inside the magnet, the direction of the field lines is from the South Pole to the North Pole.

If two magnetic field lines intersect, then at the point of intersection, the compass needle shows two different directions, which is not possible. Hence they do not intersect with each other.