Teaching horseshoe-shaped magnets u-shaped magnet magnet magnet magnet as a teaching aid AIDS is mainly used for teaching, demonstration--elementary science experiments, middle school physics experiment, and so on. Can also be used for school stationery, children's toys and other ... It can make children intuitively feel real and change of the magnetic field, and vivid expression of its physical features, more can arouse students ' interest in learning, to concentrate its attention and stimulate their thinking and imagination. Primary and middle school students and children's intellectual and mental development are of great help. Magnetic field beneficial to the human body, children can also use magnets N;S and Earth's magnetic field is repulsive, opposites attract theory, made compass magnet. In order to fully mobilize and explore the creative potential of children, develop thinking and willingness to delve into good inertial attitude!