The resistance of a conductor varies directly with its length, conversely with its cross-sectional area.
导体的电阻与其长度成正比，与其横截面积成反比。
C is a second coil formed by a conductor of much larger size and smaller length, wound around and in proximity to coil a.
是一个次极线圈，由相当大的尺寸和较小的长度构成，环绕与线圈a接近。
Therefore it is possible to simply regard the value of the induction on unit length in the near middle of two "infinite length" parallel conductor as its approximate value.
故可简单的计算中部附近单位长度上自感作为“无限长”平行导体回路单位长度自感的近似值。
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