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The teaching of large U type bar magnet, magnet, the magnet, magnet backcard
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The magnet is applied to teaching of physical experiment teaching using magnet is a key for the teaching experiment and demonstration (physics science experiment course, the primary school middle school) teaching tool. Can also be used for student stationery, children toys... Real existence and change it can make students intuitive feelings to the magnetic field, and can vividly express the specific physical characteristics, can arouse the students' interest in learning, so that their attention, stimulate their thinking and imagination. Thus, the understanding of the magnetic field and the cognition of primary and middle school students and children have a great help. Magnetic field is beneficial and harmless to humans, the child may also use a magnet N; the S pole and the repulsion of the earth's magnetic field, attraction principle 
