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questions :what is magnetic?
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[Visitor (23.83.*.*)]answers [Chinese ]Time :2020-06-15
There are many primary magnets with two opposite magnetic poles in iron. When there is no external magnetic field, the arrangement of these primary magnets is disordered, and their magnetic properties cancel each other out and do not show magnetism to the outside. When the iron is brought close to the magnet, these original magnets are neatly arranged under the action of the magnet, so that the end close to the magnet has a polarity opposite to that of the magnet and attracts each other. This shows that iron can be magnetized by the magnet due to the existence of the original magnet. However, metals such as copper and aluminum do not have the original magnet structure, so they cannot be attracted by the magnet.
What is magnetism? Simply put, magnetism is that substances placed in an uneven magnetic field will be subjected to magnetic forces. In the same non-uniform magnetic field, the strength and strength of the material is determined by the direction and strength of the magnetic force received by the unit mass of the material. Because any substance is magnetic, any substance is subject to magnetic force in an uneven magnetic field.
What really exists in the space around the magnetic pole is not the magnetic field lines, but a field, which we call the magnetic field [1]. The mutual attraction of magnetic substances is carried out by the magnetic field. We know that there is gravitational force between matter, which is a gravitational field. The magnetic field is similar, it is a field that fills the space around the magnetic pole. The strength of the magnetic field can be expressed by the number of imaginary magnetic lines of force. The magnetic field is strong where the magnetic lines are dense and the magnetic field is weak where the magnetic lines are sparse. The number of magnetic lines passing through a unit cross section is called the magnetic flux density.
Moving charged particles are subjected to a force called Lorentz in the magnetic field. The strength of the magnetic field is determined by the magnitude of the Loren magnetic force experienced by the same charged particles in different magnetic fields. Tesla is the International System Unit of Magnetic Flux Density. Magnetic flux density is a basic physical quantity describing a magnetic field, and magnetic field strength is an auxiliary quantity describing a magnetic field. Tesla (N) (1886~1943) was a Croatian-American electrical engineer who had invented transformers and AC motors.
The magnetic properties of substances are not only ubiquitous, but also diverse, and therefore have been widely researched and applied. Matters that are close to our bodies and surroundings, as far as materials in various stars and interstellars, atoms, nuclei and elementary particles in the microscopic world, and various materials in the macroscopic world, have magnetic properties of one kind or another.

How many kinds of magnetism are there in the world? Generally speaking, the magnetism of matter can be divided into diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic and ferrimagnetic.
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