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The Definition of Magnets and the Ways to Distinguish the North and South Poles of Magnets

Issuing time:2018-12-03 16:58

Magnets were used in China a long time ago. One of the four great inventions in ancient China was the principle of magnets. With the continuous progress and development of society, magnet has become a powerful material in our life. Although the process of manufacturing mandatory magnets is very slow, the development and manufacture of each kind of mandatory magnets have promoted the development of magnetics technology.

After thousands of years of development, magnet has become a powerful material in our life today. By synthesizing alloys of different materials, the same effect can be achieved as that of ferrite, and the magnetic force can also be increased. Artificial magnets emerged in the 18th century, but the process of making stronger magnetic materials was slow, until the 1920s when Alnico was produced.

Subsequently, ferrites were produced in the 1950s and rare earth magnets in the 1970s [Rare Earth magnets include NdFeB and SmCo]. So far, the science and technology of magnetism has been developing rapidly, and the high magnetic materials also make the components more miniaturized.

What is the magnetization (orientation) direction?

Most magnetic materials can be magnetized to saturation in the same direction, which is called "magnetization direction" (orientation direction). Magnets without orientation (also known as isotropic magnets) are much weaker than oriented magnets (also known as anisotropic magnets).

What is the standard definition of "North and South Pole" industry?

The definition of "Arctic" is that a magnet rotates randomly and its north pole points to the earth's North pole. Similarly, the south pole of the magnet points to the earth's South pole.

How to distinguish the north pole of a magnet without labeling?

Obviously, it is impossible to distinguish by eyes alone. A compass can be used to close to the magnet, and a pointer to the north pole of the earth will point to the south pole of the magnet.

How to safely handle and store magnets?

Always be very careful, because the magnets will stick together by themselves and may pinch your fingers. When magnets adsorb each other, they may also damage the magnet itself by collision (knocking off edges or cracking). Keep magnets away from easily magnetized items such as floppy disks, credit cards, computer monitors, watches, mobile phones, medical devices, etc.


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