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。
When the magnetic field deviates from potential or force-free field, the field-aligned current can be produced, and it relates closely with the intensity and lifetime of ducts.
当磁场偏离势场或无力场时，将会产生场向电流，该电流与导管的强度和稳定维持密切相关。
According to the characters of the work of magnetic force, the concept of potential energy can be brought in the non conservative system-magnetic field.
根据磁力做功的特点，在非保守场———磁场中也可以引入势能的概念。
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