Toy Magnets

Electromagnet can be used for electromagnetic crane, magnetic levitation trains, electromagnetic relays, speakers, motors, generators, microphone ... magnet is so widely used, the use of electromagnets, made transporting steel crane. Energized after a powerful magnetic magnet, so can suck heavy steel. Just cut off the power when you put steel can. The magnet is a combination of a variety of magnetic materials, magnetic early still excellent company began developing the use of the magnet industry. A magnet can attract or repel each other mutually substance, if an object inside the small molecules can be aligned in the same direction, it will become a magnet. Component is iron, cobalt, nickel and other special atomic structure, atomic magnetic moment itself, the general confusion molecular arrangement of these minerals. Magnetic domain magnetic influence each other to not show, but external forces (such as magnetic field) molecular orientation under the guide to converge, on the show magnetic, also known as a magnet. Iron, cobalt, nickel, is the most common magnetic substance, basically divided permanent magnets and magnet soft iron, the permanent magnet is coupled magnetic, so that the electron spin angular momentum of a magnetic material arranged in a fixed direction, it is soft plus current (also a plus magnetic method), and other current will slowly get rid of soft iron loses its magnetism. Magnets are not invented, a natural magnetite, first discovered and use magnets should be Chinese. Therefore, the "compass" is one of the four great inventions of the Chinese people. Category magnet magnet can be grouped into "permanent magnet" and "non-permanent magnets." Permanent magnet may be a natural product, known as lodestone, also be made artificially produced (the strongest magnets are neodymium magnets). The non-permanent magnets, magnetic only under certain conditions there, usually in the form of an electromagnet to produce, i.e. the use of electric current to strengthen the magnetic field.