一道物理题,D选项怎么判断啊P向下移动,P输入=P输出,P=UI,根据电流之比与线圈匝数成反比,I2=I1N1/N2, I1=I2N2/N1,P向下移动N2减小,用I2还是I1判断电流变化啊,两种正好相反?
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