The magnets we know are divided into permanent magnets and non-permanent magnets. The permanent magnet itself can also be a natural product, or it can be manufactured artificially.
Magnets have a very peculiar function. It can attract materials such as iron and nickel. It plays a very important role in industrial society. The earliest words people use are dug out from nature, but the magnetism of that kind of magnet is very weak and the magnetism is not stable enough. On the basis of this time, a magnet was made by groping step by step. Do you know how magnets are made? Read More