摘要
点电荷的表象不但可以是趋近于零的几何形体，而且可以是二维、三维空间的细圆环。这在讨论静电场电运动时有实际意义。
A point charge can be represented not only by a geometric body with its volume approaching to zero,but can also be expressed as a two or three dimensional circular ring This is practical in its significance when electrical movement of an electrostatic field is under consideration.
关键词
点电荷
静电场
几何表象
细圆环表象
representation
point charge
symmetry
undistinguishable effect
