The physical concept of magnetic field

Magnetic field, a physical concept, refers to the field that transmits the magnetic force between objects. Magnetic field is a special substance that cannot be seen or touched. The magnetic field is not composed of atoms or molecules, but the magnetic field exists objectively. Magnetic fields have the radiation properties of wave particles. There is a magnetic field around the magnet, and the interaction between the magnets is mediated by the magnetic field, so the two magnets can function without physical contact. A special form of matter that exists in space around an electric current, moving charge, magnet, or changing electric field. Since the magnetism of the magnet comes from the current, the current is the movement of the electric charge, so in general, the magnetic field is generated by the change of the moving electric charge or the electric field.

From the point of view of modern physics, the ultimate components that can form electric charge in matter are only electrons (with unit negative charge) and protons (with unit positive charge), so negative charge is a charged object with excess electrons, and positive charge is a charged object with excess electrons. A charged object with excess protons. The real source of the magnetic field produced by the moving charges is the magnetic field produced by the moving electrons or the moving protons. For example, the magnetic field produced by an electric current is the magnetic field produced by electrons moving in a wire.