The common principle is the use of the induction of an electromotive force by the variation of the magnetic flux through a coil.
一般原理均是使用通过线圈的磁通量变化感应的电动势。
Magnetic induction intensity, magnetic flux, Gauss theorem of magnetic field, Biot-Savar law, magnetic field of moved charge.
磁感应强度，磁通量，磁场的高斯定理。毕？萨定律，运动电荷产生的磁场。
When the vibration inductor does not vibrate, the magnetic induction element induces a fixed magnetic flux of the magnetic body, and the magnetic flux is a definite value.
当振动感应器未有振动时，则该磁感元件感应磁性体一固定磁通量，而该磁通量为一定值；
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