I need help help help!如图所示,R1为0~200Ω的变阻器,R2=50Ω,电源电压为20V,电流表的量程A1是0~0.6A,电流表A2的量程是0~3A.合上S,当滑动变阻器的滑片位于R1的中点时,1min通过R1的电量是多少?为了使两
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