2. Coulomb’sLaw库仑定律 Point charge点电荷的概念:点电荷是一个理想模型, 当一个带电体q的线度与它和其它带电体的距离相 比较,小得多,以致于它的形状大小及电荷分布对它 们之间的相互作用力的影响可以忽略不计时,称其 为点电荷
q Q 2. Coulomb’s Law 库仑定律 Point charge点电荷的概念：点电荷是一个理想模型， 当一个带电体 q 的线度与它和其它带电体的距离相 比较，小得多,以致于它的形状大小及电荷分布对它 们之间的相互作用力的影响可以忽略不计时，称其 为点电荷
Coulon'sLaw库仑定律 1 真空中,两个静止的点 电荷之间相互作用力的大小, 与它们的电量的乘积成正比, 与它们之间距离的平方成反 比。作用力的方向沿着它们 的联线。同号电荷相斥,异 号电荷相吸。 了=194 92 48 r 其中:60=8.85×1012C2/Nm2 大小: f= 1141921|方向:2 4 2 8 0
Coulom’s Law 库仑定律 真空中，两个静止的点 电荷之间相互作用力的大小， 与它们的电量的乘积成正比， 与它们之间距离的平方成反 比。作用力的方向沿着它们 的联线。同号电荷相斥，异 号电荷相吸。 r r q q f 3 1 2 4 0 1 = r q1 q2 大小： 2 1 2 4 0 1 r | q q | f = 方向：？？ 1 2 2 2 0 8.85 10 C / N .m − 其中： =
注意: 1.适用于真空中的静止点电荷; 2.是基本实验规律,宏观、微观均适用; That is the coulomb's law is correct and accurate in the 10-15-10%m of distance between point charges 3库仑力可以叠加
注意： 1. 适用于真空中的静止点电荷； 2. 是基本实验规律, 宏观、微观均适用； That is the Coulomb’s law is correct and accurate in the 10-15~109m of distance between point charges 3. 库仑力可以叠加
4. There is some similarity between Coulomb's law and Newton's law of universal gravitation However, gravitation is only attractive, and the force between charges is attractive or repulsive (lF 斥) 1q1q2 fNG=G 4兀Er 仅有吸引 吸引和排斥!
4. There is some similarity between Coulomb’s law and Newton’s law of universal gravitation. However, gravitation is only attractive , and the force between charges is attractive or repulsive(排 斥） r r q q f c 3 1 2 4 0 1 r = r m m f G G 3 1 2 = 仅有吸引！ 吸引和排斥！
5. The seeing world is held together by gravitation the atom, the molecules, solid crystal lattice(固体晶 R)and seeing matter are held together by the electric force:..There are different forces in the different levels of World, which hold together the matter of levels in the universe(宇宙) Universe 2 Seeing matter
5. The seeing world is held together by gravitation ; the atom, the molecules, solid crystal lattice（固体晶 格）and seeing matter are held together by the electric force;……There are different forces in the different levels of World, which hold together the matter of levels in the universe(宇宙）. Universe Seeing matter