Strong magnets
What is the magnet? Magnetic is an object or material that can produce a magnetic field. It has the characteristics of attracting metal such as iron, nickel, and cobalt. It can be traditionally divided into "permanent magnets" and "non -permanent magnets".Permanent magnets can be a natural product, also known as natural magnets, and can also be made by artificially (the strongest magnet is the iron boron magnet). Instead of permanent magnets, magneticity will be lost.The ancient Greeks and the Chinese found that there was a natural magnetized stone in nature, which was called "iron -absorbing stone". This stone can suck small pieces of iron -like, and always point in the same direction after setting up. Early navigators used this magnet as their earliest compass to distinguish the direction at sea.After thousands of years of development, magnets have become an indispensable functional material in our lives today. The alloy of different materials through advanced powder metallurgical pr