1. Harm of magnet magnetic field: Magnet magnetic field will promote blood circulation of human body. There is no data showing that the magnetic field of magnet has direct harm to human body, so don't worry too much about the magnetic field of magnet.

2. Whether the magnetic field is harmful to human body depends on the strength of the magnetic field. Generally speaking, magnets below 3000 gauss (magnetic field unit) are harmless to human body, and magnets with magnetic field intensity above 3000 are harmful to human body. Although magnets are harmful to the human body, some people are afraid that magnetic fields will affect the human body, but according to tests, the influence of magnetic fields on people is only one-fifth of that of television.

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Magnets can be divided into "permanent magnets" and "non-permanent magnets". Permanent magnets are widely used in dry electronics, electric power, machinery, transportation, medical care, daily necessities and other fields. Such as speakers and telephone handsets; Magnetic system of magnetoelectric instrument: magnetic poles in generators and permanent magnet motors.

Permanent magnet devices used in mechanical manufacturing (such as permanent magnet sucker of surface grinder, etc.). ), magnetic suspension system and magnetic bearing; Magnetic separation system, magnetic dressing, magnetized water purification system, magnetic system of magnetron and proton accelerator, etc.

Non-permanent magnets, such as electromagnets, are magnetic only under certain conditions. The magnetism of matter is not only ubiquitous, but also varied, so it has been widely studied and applied. Objects and substances around them, substances in various stars and interstellar spaces, atoms, nuclei and elementary particles in the microscopic world, and substances in the macroscopic world are all magnetic in one way or another.

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