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What checking the N and S poles of the magnet?
If there is only one magnet N · S pole is unknown, to make sure there is no iron or the like, select a location where it is found north direction will first be attracted to the magnet around. Then you eat with the head of the nail (the surface which adsorbs strongly) two surfaces facing each other was in the magnetization direction with a string hanging the magnet. Then, nail of one points to the north direction. The surface is the N pole.