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一、本月知识学习指要１．库仑定律Ｆ＝ｋｑ１ｑ２／ｒ２只适用于真空中两个点电荷间电场力大小的计算，库仑力的方向由“同种电荷相斥，异种电荷相吸”判断．２．电场强度的定义式为Ｅ＝Ｆ／ｑ，电势差的定义式为Ｕ＝Ｗ／ｑ；电场强度与电势差是分别描述电场力性质与能性质的
First, this month’s knowledge study refers to 1. Coulomb’s law F=kq1q2/r2 is only applicable to the calculation of the electric field force between two point charges in a vacuum, and the direction of Coulomb force is judged by the “repulsion of the same kind of charge and the attraction of dissimilar charges”. 2. The definition of the electric field strength is E=F/q, and the definition of the potential difference is U=W/q; the electric field strength and the electric potential difference are the properties of the electric field and the energy properties.