如图所示,带等量异种电荷的小球A、B固定在绝缘水平面上,间距为L,将长度为L、内壁光滑的绝缘细管竖直置于小球连线的中垂线上,从上管口落入一带电小球C,若A、B、C可视为质点且电荷量大小均为q,则( )
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513713686396928/2514033965096960/STEM/688df79e-43ed-44cb-bc73-49c5000adbab.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513713686396928/2514033965096960/STEM/688df79e-43ed-44cb-bc73-49c5000adbab.png?resizew=200)
A.细管中的电场强度方向向上 |
B.小球C下落过程中受到细管的弹力逐渐减小 |
C.小球C在上管口时受到的弹力大小为![]() |
D.小球C在下落过程中的加速度始终为g |
更新时间:2020-07-26 08:38:06
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【推荐1】A、B两个小球带同种电荷,放在光滑的绝缘水平面上,A的质量为m,B的质量为2m,它们相距为d,同时由静止释放,在它们距离到2d时,A的加速度为a,速度为v,则( )
A.此时B的加速度为a/4 | B.此过程中电势能减小5mv2/8 |
C.此过程中电势能减小mv2/4 | D.此时B的速度为v/2 |
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【推荐2】真空中,绝缘水平面上有两个带电荷量均为
的小物体A、B,质量分别为
,且
,两者均可看做质点。当相距L时,A、B均静止,如图所示。已知两物体和水平面间的动摩擦因数均为
,静电力常量为k,重力加速度为g。则下列判断正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b2087eadbbd0dab72b7483b9181585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a44bd2d4c112e44f7a6a96c3dbea8bb0.png)
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A.A物体受到的摩擦力大小为![]() |
B.若只将A物体的电荷量增至![]() |
C.若只将A物体的电荷量增至![]() ![]() |
D.若只将A物体的电荷量增至![]() |
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【推荐1】电荷量大小均为
的四个点电荷分别固定在圆心为
、半径为
的圆周
处,电性如图所示,
为圆的三等分点,
为圆弧
的中点,已知静电力常是为
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处电场强度的大小为( )
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【推荐2】如图,边长为
的立方体
八个顶点上有八个带电质点,其中顶点
、
电量分别为
、
,其他顶点电量未知,
点上的质点仅在静电力作用下处于平衡状态,现将
上质点电量变成
,则顶点
上质点受力的合力为(不计重力)( ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
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A.![]() | B.![]() | C.![]() | D.0 |
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