The fluctuating mangnetic field cutting across the turns or loops of wire of the secondary coil sets up an electrical pressure or voltage in these loops . 起伏变化的磁场横向切割着次极线圈的线匝和线环时，会在这些线环中引起电压。
2.
The fluctuating magnetic field cutting across the turns of loops of wire of the secondary coil sets up an electrical pressure or voltage in these loops . 起伏变化的磁场横向切割着的次级线圈的线匝或线环时，会在这些线环中引起电压。
