人类最早发现磁现象是从磁铁开始的，后来才逐渐认识到磁与电的关系。磁铁有N/S两极，他们同号相斥，异号相吸，这一点同正负电荷有很大的相似性。
电流环与磁偶极子等效变换中的磁荷计算_电子资料文库 关键词:磁荷,磁偶极矩,电流环,磁矩, [gap=803]Key words: magnetic charge, magnetic dipole moment, molecular current, magnetic moment.
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等效磁荷法计算精度高，但计算过程相对复杂。
Computational accuracy of equivalent magnetic charge method is high, but its calculation is complicated.
第二个定理定义了“等效磁荷”与‘电流密度矩’。
The second theorem defines the Equivalent Magnetic Charge and the Moment of Current Density.
同时还证明在磁荷为零的区域两个四维矢势可以合并为一个。
It also shows that two four vector potential can be combined into one four vector potential in the region being free of magnetic charges.
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