本文从导体的过剩电荷“被限制在表面的,一薄层内”这—事实出发,由半径为R的带电导体球这一特例求得导体与表面的电位差。由此说明把导体静电平衡性质之一表述为“导体是个等位体、导体表面是等位面”的必要性。 This article proceeds from the fact that the excess charge of the conductor “is confined to the surface within a thin layer” - the difference between the conductor and the surface is derived from the fact that the charged conductor sphere of radius R is a special case. This shows that one of the properties of the electrostatic balance of the conductor is expressed as “the conductor is an equipotential, the conductor surface is the equipotential” necessity.