It works in conjunction with the electric potential, electric charge and dielectric models, and requires a positive electrical conductivity of the fluid.
资讯科技和电位，电荷和介质模型一起工作，而且需要液体的一个积极导电系数。
When a suBstance has no net electrical charge, the total numBers of positive and negative charges within it must just Be equal.
当物质没有净电荷时，它内部的正负电荷总数必定正好相等。
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