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全日制普通高级中学教科书(试验本修订本,必修加选修)物理第二册p.91指出:自然界只存在两种电荷:正电荷和负电荷.同种电荷相互排斥,异种电荷相互吸引.库仑定律所研究的对象为点电荷,它是一种理想化的物理模型.指的是带电体间的距离比他们自身的大小大得多,以至带电体的形状和大小对相互作用力的影响可以忽略不计,这样的带电体就可以看作点电荷.毋容置疑,同种点电荷间的相互作用力定为斥力.若两个同种电荷的带电体之间的作用力是否一定为斥力呢?为了讨论问题的简便,请看简化了的问题如下:
Full-time regular high school textbooks (revised test book, compulsory and optional) Physical second volume p.91 points out that there are only two kinds of charges in nature: positive charge and negative charge. The same kind of charges are mutually exclusive and heterogeneous charges attract each other. Coulomb The object studied by the law is the point charge, which is an idealized physical model. It means that the distance between charged bodies is much larger than their own, so that the shape and size of the charged body can affect the interaction force. Neglectingly, such a charged body can be regarded as a point charge. Undoubtedly, the interaction force between the same kind of point charge is defined as a repulsive force. If the force between two charged bodies of the same kind of charge is necessarily a repulsive force To discuss the simplicity of the problem, look at the simplified issues as follows: