题目内容
如图所示,长为L、倾角为
的光滑绝缘斜面处于电场中,一带电量为
、质量为
的小球,以初速度
从斜面底端A点开始沿斜面上滑,当到达斜面顶端B点时,速度仍为
,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017206912048.jpg)
A.A、B两点间的电压一定等于![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720707776.png)
B.小球在B点的电势能一定大于在A点的电势能
C.若电场是匀强电场,则该电场的电场强度的最大值为![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720738528.png)
D.若该电场是斜面中点正上方某点的点电荷Q产生的,则Q一定是正电荷
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720597299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720613330.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720629339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720644323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720644323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017206912048.jpg)
A.A、B两点间的电压一定等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720707776.png)
B.小球在B点的电势能一定大于在A点的电势能
C.若电场是匀强电场,则该电场的电场强度的最大值为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720738528.png)
D.若该电场是斜面中点正上方某点的点电荷Q产生的,则Q一定是正电荷
A
试题分析:根据动能定理:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017207381352.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720753990.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001720769721.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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