First of all, Bian Xiao shows you what a magnet is. Iron is a substance with magnetic moment, which is composed of atoms with special internal structure such as iron, cobalt and nickel. Magnets can generate magnetic fields and attract ferromagnetic substances, such as iron, nickel, cobalt and other metals. Types of magnets: shape magnets: square magnets, ceramic tile magnets, irregular magnets, cylindrical magnets, circular magnets, disc magnets, bar magnets, magnetic frame magnets, nature magnets: samarium cobalt magnets, neodymium magnets (strong magnets), ferrite magnets, Al-Ni-Co magnets, Fe-Cr-Co magnets, industrial magnets: magnetic elements, motor magnets, rubber magnets, plastic magnets. Magnets are divided into permanent magnets and soft magnets. Permanent magnets strengthen magnetism, so that the spin of magnetic substances and the angular momentum of electrons are arranged in a fixed direction, while soft magnets are electrified.
Then Bian Xiao will show you how magnets are made. Magnets are not invented by people, but natural magnetite. The ancient Greeks and China discovered a naturally magnetized stone in nature, which they called? Magnetite? . This kind of stone can magically pick up a small piece of iron and swing it at will and always point in the same direction. Early navigators used this magnet as their earliest compass to tell directions at sea. China people were the first to discover and use magnets? Compass? , is one of the four great inventions in China.
Ok, Bian Xiao will take you here today. I believe everyone has different ideas. If you have anything to share with us, you can leave a message at the bottom of the comments section.