题目内容
在点电荷Q的电场中,一个α粒子(
)通过时的轨迹如图实线所示,a、b为两个等势面,则下列判断中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012405612792.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001240499400.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012405612792.jpg)
A.α粒子经过两等势面的动能![]() |
B.运动中粒子总是克服电场力做功 |
C.Q可能为正电荷,也可能为负电荷 |
D.α粒子在两等势面上的电势能![]() |
A
试题分析:从粒子运动轨迹看出,轨迹向左弯曲,可知带电粒子受到了排斥力作用,故Q为正电荷;从a到b过程中,电场力做功为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250012406241066.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001240624588.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001240592591.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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