Magnet introduction
A magnet refers to a substance or material that can generate a magnetic field. It is a peculiar substance. It has an invisible force that can attract some substances and repel some substances. Generally divided into permanent magnets and soft magnets.
The magnet has two polarities, a magnetic north pole N and a magnetic south pole S. After being cut off, it is still a two-pole N-level and S pole. No single pole can exist. At the same time, the magnet is directional. If you hang a magnet, you will find that its south pole points to the left and right of the geographic south magnetic pole, and the north pole points to the left and right of the geographic north magnetic pole.