The three-dimensional currency demonstrator with magnetic induction is mainly used in the teaching of physical magnetic field in middle schools, and visually displays the direction of the magnetic field at different points in the space around the magnetic field and the formation of the direction and direction of the magnetic flux. Magnetic field on the induction wire. The instrument consists of a ribbon magnet, a latch magnet, six rectangular transparent magnetic induction plates, a crescent-shaped transparent magnetic induction plate and a fixed bracket. During the demonstration, shake the demonstrator several times to make the small iron pieces look irregular. Pull out the movable board in a semicircle, insert the cross-shaped magnet, and then paste the surface of the board and tap it lightly. Magnetic core currency appears in a magnetic field. Demonstration experiment used to explain the existence of magnetic field and the spatial distribution of magnetic field lines If you are experimenting with ribbon magnets, placing the semicircular plate on top of the I-shaped plate is sufficient.