如图所示，平行金属板中带电质点P原处于静止状态，不考虑电流表和电压表对电路的影响，当滑动变阻器R4的滑片向b端移动时，则_刷题宝

题干

如图所示，平行金属板中带电质点P原处于静止状态，不考虑电流表和电压表对电路的影响，当滑动变阻器R₄的滑片向b端移动时，则

A：电压表读数减小

B：电流表读数减小

C：质点P将向上运动

D：电源的输出功率一定增大

上一题下一题 0.0难度选择题更新时间:2016-05-26 09:58:57

答案(点此获取答案解析）

A

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