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一、知识展台1.认识E=F/q、E=kQ/r~2的含义E=F/q是电场强度的定义式,电场强度只由电场的因素——场源电荷的电量和在场中的位置决定.该式适用于一切电场强度的计算.点电荷形成的电场中,某点的电场强度的决定式为E=F/q=kQq/r~2·1/q=kq/r~2.公式E=kQ/r~2中,没有涉及检验电荷的物理量,也说明了点电荷形成的电场中某点电场强度与检验电荷无关.该式只适用于点电荷在真空中形成的电场.2.电场的叠加:电场需按矢量的运算法
First, the knowledge of Booth 1. Knowledge of E = F / q, E = kQ / r ~ 2 Meaning E = F / q is the definition of electric field strength, electric field strength only by the electric field - In the electric field formed by the point charge, the electric field intensity at a certain point is determined as E = F / q = kQq / r ~ 2 · 1 / q = kq / r ~ 2. The formula E = kQ / r ~ 2 does not involve the physical quantity of the test charge, and also shows that the electric field intensity at a point in the electric field formed by the point charge has nothing to do with the test charge. This formula is only applicable to the formation of point charge in vacuum Electric field .2. Electric field superposition: The electric field needs the vector algorithm