Magnets Are Substances That Can Be Attracted To Each Other Or Mutually Exclusive

  Magnets are substances that can be attracted to each other or mutually exclusive. If a small molecule inside an object can be arranged in the same direction, it becomes a magnet. Ingredients are iron, cobalt, nickel and other atomic structure of the special, the atom itself has a magnetic moment, the general arrangement of these mineral molecules chaos. Magnetic field interaction can not show the magnetic, but in the external force (such as magnetic field) under the guidance of molecular alignment direction tends to coincide, it shows the magnetic, that is commonly known as the magnet. Iron, cobalt, nickel, is the most commonly used magnetic material, basically the magnetic sub-permanent magnet and soft iron, permanent magnet is coupled with strong magnetic, magnetic material spin and electronic angular momentum into a fixed direction, soft magnetic Plus the current (also a method of adding magnetic force) and other current to remove the soft iron will slowly lose the magnetic. Magnet is not human invention, there are natural magnetite, the earliest discovery and use of magnets should be Chinese. So "compass" is one of the four Chinese inventions.

  Magnets can be divided into "permanent magnets" and "non-permanent magnets". Permanent magnets can be natural products, also known as natural magnets, can also be manufactured by artificial (the strongest magnet is neodymium magnets). Rather than permanent magnets, only under certain conditions there will be magnetic, usually in the form of an electromagnet, that is, the use of current to strengthen its magnetic field.