关于安环定理在—段有限长稳恒电流磁场中的讨论

About Magnetic Field of Limited Steady Curret on Length Meet Ampepe's Law

安培环路走理只对稳恒闭合电流的磁场成立，而对一段有限长电流的磁场不成立．但是，因为有限与无限都是一个相对的概念，它们之间并不存在一条不可逾越的鸿沟，在一定条件下可以互相转化，所以在一定条件下，一段有限长电流的磁场也满足安培环路定理。

The magnetic field of the limitless current on length meets Ampere's law,but it of the limited current on length don't.Both's limited and the limitless on length are relative.Under given conditions,they may transform oneself into one's opposite.Therefore under given conditions,the magnetic field of limited current on length too meets Ampere's law.