8+=-EoR Cos 8+(+-@ EoR cos0 4T Re Pn=-EoRCos 6+9o tREx EoR cose 原电导球电势 偶极子项 可见一个带电导体球放入外电场中,就如在带电导体球原点处产生了一个偶极子,其实我们 可以用镜像电荷法简单的来看一下这个问题 a uniform field can be thought of as being produced by appropriate positive and negative charges at infinity →B0 R R (a) +Q z〓R R (b)3 0 0 0 0 2 0 E cos -E 4 Q R R Cos R R       外 = + + + 3 0 0 0 0 2 0 E cos -E 4 Q R R Cos R R       外 = + + + 源场 偶极子项 原电导球电势 可见一个带电导体球放入外电场中，就如在带电导体球原点处产生了一个偶极子，其实我们 可以用镜像电荷法简单的来看一下这个问题。 A uniform field can be thought of as being produced by appropriate positive and negative charges at infinity: