互感系数（coefficient of mutual induction）是互感现象中在一个电路中所感生的磁通除以在另一个电路中产生该磁通的电流，互感系数的公式为ε1=M×ΔI2/Δt。 一个线圈中的互感电动势不仅与另一线圈中电流改变的快慢有关，而且也与两个线圈的结构以及它们之间的相对位置有关。由毕奥—萨伐尔定律，电流产生的磁场大小与电流成正比
传输线路之间的互感系数是计算纵电动势和纵电压的重要参量。
Mutual inductance coefficient between transmission lines is an important parameter for the calculation of longitudinal electromotive force and longitudinal voltage.
用三维有限元方法分析计算了几类电流互感器的三维磁场和互感系数。
The magnetic field and mutual inductance are calculated with 3-d (three-Dimensional) finite element method for some types of current transducer.
如果电力线与通信线之间的互感系数已经知道了，那么计算它们之间的电磁感应效应是很容易的。
The inductive effects between power lines and telecommunication lines can easily be calculated if the mutual inductance has been known.
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