题目内容
如图所示的匀强电场中,水平等距离的虚线表示其等势面,带电荷量
粒子只在电场力作用下从A点运动到B点过程中,动能增加
,若A点电势为一10V,下列关于粒子的运动轨迹和B点电势的说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030583663367.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003058335746.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003058351562.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030583663367.jpg)
A.粒子沿轨迹l运动,B点电势为零 |
B.粒子沿轨迹2运动,B点电势为20V |
C.粒子沿轨迹1运动,B点电势为一20V |
D.粒子沿轨迹2运动,B点电势为一20V |
A
试题分析:粒子从A点运动到B点,动能增加,电场力做正功,电场力方向必定向上,又根据电场力将指向运动轨迹的内侧,所以粒子沿轨道1运动.根据动能定理得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003058382762.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030584131494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003058507639.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003058522986.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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