根据张庚骥先生的向量势理论，自然电位不是由偶极层产生，而是由旋度源产生，旋度源在偶极层的边缘。
According to Mr Zhang's vector potential theory, SP doesn't generated or originated from dipole layers but curl sources in the borders of dipole layers.
当然这并非巧合，因为这个向量场是有势场。
And, of course, it is not a coincidence because this vector field is a gradient field.
这就是计算的一般方法，但求功的时候，如果向量场是某个势的梯度,是有捷径可走的。
OK, so that's the general method of calculation, but we've seen a shortcut for work when we can show that the field is the gradient of potential.
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