2. Temporary magnets and permanent magnets: ferromagnetic materials are easy to lose their magnetism after being magnetized, which is called temporary magnets; Ferromagnetic materials are not easy to lose their magnetism after being magnetized, so they are called permanent magnets.
3. Magnets have magnetic poles, and each magnet has two kinds of magnetic poles, N pole and S pole, which exist in pairs.
When two magnets are close together, the same magnetic poles will repel each other, and different magnetic poles will attract each other and stick together. Like-sex repulsion, like-sex attraction.
Use of magnets
Magnets are substances that can attract or repel each other. If the tiny parts inside an object can be arranged in the same direction, it will become a magnet.
The components are atoms with special structures such as iron, cobalt and nickel, and the atoms themselves have magnetic moments, so the general molecules of these minerals are arranged in disorder. When magnetic fields interact, they can't show magnetism, but under the guidance of external forces, the molecular arrangement direction tends to be the same, so they show magnetism, which is also commonly known as magnets.
It is the most commonly used magnetic substance. Basically, magnets are divided into permanent magnets and soft magnets. With the strong magnetism of the permanent magnet, the spin of the magnetic substance is arranged in a fixed direction with the angular momentum of the electron. Magnetism plus current to remove soft iron will gradually lose its magnetism.