题目内容
如图所示的电路中,总电压U保持不变,滑动变阻器总电阻为2R.当滑片位于变阻器的中点O时,四个电流表的示数都等于I0,当滑片向处移动到O′点时( )
2021-07-21
A.A1的示数大于I0
B.A2的示数大于I0
C.A3的示数大于I0
D.A4的示数大于I0
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