Magnet is right the attract ability of other metal

Since magnetite can attract iron, be to return so can is attract other metal? Our first civilian made a lot of attempts, discover magnetite not only cannot the metal such as attract gold, silver-colored, copper, also cannot the article of attract tile and so on. Everybody shows the time of the Western Han Dynasty cognizant arrives magnetite can attract iron, and cannot attract is other article. Should put two magnet in together when each other get close to, divide each other attract sometimes, divide each other to elbow out sometimes. Everybody knows magnetic body has two now extremely, one weighs N pole, one weighs S pole. Each other elbow out same sex pole, opposite sex pole each other attract. The everybody in those days does not know this truth, but still can be aware of to this idea.

Arrived the Western Han Dynasty, have an alchemist that is called Luan Da, this individual character of his use magnet did the thing like two castle character, the course adjusts each other position of two castle polarity, sometimes two castle each other attract, sometimes each other are elbowed out. Luan Da call his " fight a chess " . He plays what this sends individually meaning give Han Wu emperor, demonstrate on the spot. Chinese fierce emperor is amazed unceasingly, dragon heart exultation, seal Luan Dawei unexpectedly " 5 benefit general " . Luan Da uses the property of magnetite, made play chicly meaning cheated Han Wu emperor.

The earth also is a large magnetic body, two its extremely be in the place of get close toingly area antarctic and ground area arctic respectively. Consequently the magnet of earthly surface, when can rolling freely, because magnetic body same sex is exclusive,meet, the property that opposite sex photograph sucks indicates north and south. This truth the ancients is no good understanding, but they understand this kind of idea very much.

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