在初中“磁场和磁感应线”教学中，传统的教学法是把细铁屑放在玻璃板上，演示磁体的磁感应线分布．不易举起和保持，有一定的局限性．在实验过程中，我探索出操作简单、行之有效、又可用于电化教学的方法．把蹄形磁铁平放于桌面上，在磁铁两侧放两块与磁体高度相等的两块木块? In junior high school “magnetic field and magnetic induction line” teaching, the traditional teaching method is to put fine iron on the glass plate, showing the magnetic induction line distribution. Difficult to lift and maintain, there are some limitations. During the experiment, I explored a simple, effective, and can be used for electrochemical teaching methods. Put the hoof-shaped magnet flat on the desktop, put two pieces of wood with the same height as the magnets on both sides of the magnet?