It is pointed out that the self-induction coefficient is relative to the current frequency in the actual conductor circuit, even if there is not any magnetic medium.

指出在无磁介质存在的条件下，实际导体回路的自感系数也与电流频率有关。

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By debating about the two definitions of inter-induction coefficient and self-induction coefficient, we can discover the internal difference and the suitable condition.

通过对互感和自感系数两种定义式的讨论，找出两种定义式的内在区别和适应的条件。

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Self-induction coefficient is an important conception in the electromagnetic induction. There are three definitions for it : static definition, dynamic definition and energy definition.

自感系数是电磁感应现象中的重要概念，关于它的定义可归纳为静态定义、动态定义和能量定义。

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