Using the slider to drive a metal bar to cut perpendicularly the uniform magnetic field in the center of a Helmholtz coil, induction electromotive force could be produced.

利用滑块带动金属杆切割亥姆霍兹线圈中心区域匀强磁场的磁感应线，可以产生感应电动势。

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A general formula is given for calculating the mutual impedance be tween two dipoles by means of the induced electromotive method and the field transformation formula.

本文采用感应电动势法和场量变换公式给出了计算二振子互阻抗的一般公式。

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This field force is called magnetomotive force (MMF), and is very much analogous to electromotive force (e) in an electric circuit.

这个场力被称作磁动力(mmf)，非常类似于电路中的电动里(E)。

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