表示电磁相互作用能量
Expressing the electromagnetic interaction energy
摘要：
给定的电荷和电流分布与电磁外场的相互作用能由该分布的多极张量的笛卡尔分量表示。特别注意这些张量的对称无痕的减少。虽然在显式计算中使用了笛卡尔张量分量，但最终结果以一致的张量形式给出。
英文摘要：
The interaction energy of a given distribution of electric charges and currents with an electromagnetic external field is expressed by the Cartesian components of the multipole tensors of this distribution. Special attention is paid to the reduction of these tensors to the symmetric traceless ones. Although one uses the Cartesian tensor components in the explicit calculations, the final results are given in consistent tensorial form.
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