中文摘要：

导体和外电场的相互作用静电能中，有一个著名的1／2问题．本文从点电荷观点、电介质的机械类比以及电介质热力学关系等几个不同角度来讨论这个问题．同时，将论述有关静电场能量问题的几个容易引起混淆的关系．

英文摘要：

There is a famous 1/2 problem in the interaction energy between a conductor and an external electrical field. This paper expounds this problem from different viewpoints such as point charge model, mechanical analogy of electric media and thermodynamic relations of electric media. Meanwhile, we clarify some complex relations concerning electrostatic energy.