... expression of human nature 人性表现 circular electric current 圆电流 naso-orbital-ethmoid fractures 鼻骨-眶-筛骨骨折 ...
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圆电流是一个经典的物理模型。
采用将圆电流磁矢势表达式中一部分展成级数，使被积函数变成可积分的函数。
A part of results on magnetic vector potential of circular loop are expanded, so the integral function is transformed to integrable series.
本文包括（1）应用毕奥—沙伐尔定律和级数求解，找出圆电流产生在任意点磁场的算式；
The contens of this paper are: (1) applying Biot—Savart law and series expansion, find out the calculation formulas the magnetic field produced by circular current at arbitrary point;
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