Magnetic Field of Permanent Magnet

Imagine a typical compass needle magnet mounted on a pin which allows it to rotate in a plane. If we hold a needle near a bar magnet, **the needle will align itself along the lines of magnetic flux but pointed in opposite direction**. If the bar magnet has north pointing left then when parallel to it, **the compass will have right pointing north**.



By moving the compass around, it can be seen that the **magnetic field of the large magnet is continuous**. The magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are near the poles.



A magnetic north pole will attract the south pole of another magnet, and repel a north pole. The lines of magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and in to the South pole of the magnet. Permanent magnets are made from the ferromagnetic materials. A magnetic field of a bar magnet thus results from the motion of negatively charged electrons in the magnet.