Ac current probe act as a current transformer which the core can be opened and clamped on a current carrying conductor.

交流电流探头是利用电流变压器的原理来测试电流的﹐它的中心部分可以打开和卡紧在有电流流过的导线上。

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Inspired by the force action caused by magnetic field to current carrying conductor and Newton's third law, we tried to make a new type of DC motor, yet we failed.

受磁场对载流导线有力的作用和牛顿第三定律的启发，希望制造一种新型的直流电动机。然而失败了。

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In this paper, the calculating formulas of magnetic field for long current carrying conductor with any form of cross-section are deduced with the help of magnetic vector potential.

本文由磁矢量位出发，导出具有任意形状截面的长导体磁场计算公式。

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