According to the principle of virtual-work, the formula of electromagnetic force based on magnetic vector potential is deduced.
根据虚位移原理，推导出基于矢量磁势的电磁力计算公式。
The general formula for calculating the work of Ampere's force is derived according to the Ampere's law and the Faraday's law of electromagnetic induction.
通过安培定律与法拉第电磁感应定律导出安培力做功的一股公式。
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