题目内容
如图所示,一个电荷量为-Q的点电荷甲,固定在绝缘水平面上的O点。另一个电荷量为+q、质量为m的点电荷乙,从A点以初速度v0沿它们的连线向甲运动,到B点时的速度减小到最小为v。已知点电荷乙与水平面的动摩擦因数为μ,A、B间距离为L及静电力常量为k,则下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041420554333.jpg)
A.点电荷甲在B点处的电场强度大小为
B.O、B间的距离大于![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004142086828.png)
C.在点电荷甲形成的电场中,A、B间电势差UAB=
D.点电荷甲形成的电场中,A点的电势小于B点的电势
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041420554333.jpg)
A.点电荷甲在B点处的电场强度大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004142070581.png)
B.O、B间的距离大于
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004142086828.png)
C.在点电荷甲形成的电场中,A、B间电势差UAB=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004142117904.png)
D.点电荷甲形成的电场中,A点的电势小于B点的电势
A
试题分析:点电荷乙从A向B减速运动,受电场力和摩擦力,在B点减速到最小,可知在B点电场力等于摩擦力,所以点电荷甲在B点处的电场强度大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004142133752.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004142133933.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041421481016.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041421641170.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250041421951265.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目