Under the condition that the electrical potential of a immeasurable-distant-away point is zero, the outer potential of a electrically neutral charge group is not always zero, and, to any electrically neutral charge group, the potential will be dipole-alike distribution. 在选取无限远处为零电势参考点情况下,电中性电荷系外部的电势不一定为零,对于任意电中性电荷系将出现类偶极子电势分布。