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我们知道,将中性金属导体放入外电场(E_0)之中,达成静电平衡后,导体内各点的场强为零,是由于静电感应作用,导体表面产生的感应电荷在导体内激发的电场(E’)和外电场方向相反,将外电场抵消的结果.对此,一些学生提出:如果外电场特别强(当然,应当是实验条件下能实现的电场),感应电荷的电场还能将外电场完全抵消吗?
We know that when a neutral metal conductor is placed in an external electric field (E_0) and the electrostatic equilibrium is reached, the field strength at each point in the conductor is zero due to the electrostatic induction. The induced electric charge generated on the conductor surface excites the electric field in the conductor. (E′) Contrary to the direction of the external electric field, offset the external electric field. For this, some students suggested that if the external electric field is particularly strong (of course, it should be the electric field that can be achieved under experimental conditions), the electric field of the induced electric charge can also Does the external electric field completely cancel?