在电磁教学中,如何让学生更直观地理解原理是一个难点问题。为此,可以利用简易材料,自制“简易磁力小车”用于教学。该小车所受的动力运用了同名磁极相斥、异名磁极相吸的原理。小车在磁力作用下,虽然与轨道之间存在摩擦,但仍能以0.1 m/s以上的速度运行,效果非常明显。 In electromagnetic teaching, how to make students more intuitive understanding of the principle is a difficult issue. To this end, can use simple materials, self-made “simple magnetic car ” for teaching. The power of the car using the same name of the pole repulsion, the same principle of attraction of different poles. Under the action of magnetic force, the car can still operate at a speed of 0.1 m / s or more although there is friction with the track, the effect is very obvious.