What are the characteristics of magnets?

The basic property of a magnet is called magnetism, that is, there is a magnetic field with two poles (or a magnetic monopole). According to Lorenz theorem, all magnetic fields are phenomena of electromagnetic fields, or the result of electron movement. In other words, if there is no current or movement of electrons, there is no magnetic field. The same charge attracts opposite charges between the poles of the magnetic field. In addition, the magnetic field also acts on all charged bodies or moving charges (commonly known as current). Among them, the most common ones are: the attraction of magnets to ferromagnets; Generators and motors; Deflection coil of kinescope, etc. All these effects are the interaction between electromagnetic field and moving charge (current).