推迟势幂级数展开的正确方法

An Power Series Expansion Method of Retarded Potential

对电磁场推迟势的常见多极展开方法进行了修正和补充。

The common multiple pole expanding method for retarded potential of electromagnetic field is corrected and replenished. Employing Taylor series method the exact result of the first three terms in multiple pole expansion is achieved.