关于虚功法计算电场力的讨论

A Comment on the Electric Field Force Calculated with the Method of Virtual Work

根据能量守恒和转换定律，讨论由虚功法求介质从平板电容器中移出时所受电场力解可能得到错误答案的原因．

According to the law of conservation and translation of energy,this paper discusses the reason why the explanation of electric field force calculated with the method of virtual work on a dielectric slab when pulled out from a parallelplate capacitor is incorrect.