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如图所示,A、B、C为三块水平放置的金属板,板的厚度不计,间距均为d,A、B板中央有小孔.电路中三只电阻的阻值相等均为R,电源内阻也为R.现有一质量为m的带电液滴在距A板小孔正上方为d处静止开始下落,不计空气阻力,当它到达C板时速度恰为零.忽略极板外电场.求:(1)液滴通过B板中央小孔时的速度大小.(2)液滴从静止的位置到B板的运动过程中其电势能是增加还是减少?变化了多少?
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参考答案:
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参考解析:
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