根据电磁力原理
According to the principle of electromagnetic force
以上为机器翻译结果，长、整句建议使用 人工翻译 。
根据虚位移原理，推导出基于矢量磁势的电磁力计算公式。
According to the principle of virtual-work, the formula of electromagnetic force based on magnetic vector potential is deduced.
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