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中师《物理学》第二册中，静电学的第一个演示实验“电荷间的相互作用”，旨在定性验证两个电荷（同种或异种）间的相互作用力与电荷间的距离及电荷量大小的关系。我们对此实验进行了改进，用投影方法使实验易于观察（投影器光源的热量有助于空气干燥），效果更佳。同时，师范
In the second volume of the Division “Physics” in the division of Physics, the first demonstration experiment of electrostatics “the interaction between charges” aims to qualitatively verify the distance between the charge and the charge between two charges (homogeneous or heterogeneous). And the relationship between the size of the charge. We have improved this experiment by making the experiment easy to observe with the projection method (the heat of the projector light source contributes to air drying) and the effect is better. At the same time, teacher