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This set of magnets is used in the teaching of physics.Experimental and demonstration teaching tools for primary school science experiments and middle school physics experiments. They can also be used for student stationery, preschool toys, etc. It can not only allow students to intuitively feel the real existence and changes of the magnetic field, but also express its physical characteristics concretely, vividly, and more importantly, it can arouse students' learning interest, concentrate their attention, and stimulate their thinking and imagination. This will greatly help and promote the understanding and cognition of magnetic fields for primary and secondary school students and children. Magnetic fields can also be used by children to take advantage of the N and S poles of magnets to repel each other with the Earth's magnetic field..The principle of attraction between the opposite sex