题目内容
如图所示,虚线为一静电场中的等势面1、2、3、4,相邻等势面间的电势差相等,其中等势面3的电势为0。一带正电的点电荷仅在静电力的作用下沿图中实线从a点运动到b点,经过a、b两点时粒子的动能分别为5eV和26eV。当这一点电荷运动到某一位置c时,其电势能变为-5 eV。下列说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242354566082016.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242354566082016.png)
A.粒子从a点运动到b点的过程中电场力做负功 |
B.粒子在a点的电势能小于其在b点的电势能 |
C.粒子在c点时的动能为24 eV |
D.a、b点的电势关系为![]() |
CD
试题分析:带正电的点电荷仅在静电力的作用下沿图中实线从a点运动到b点,只有电场力做功,根据动能定理得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242354593231326.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235500430931.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235501460601.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235502411613.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235503535629.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235505017668.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235506623602.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235507731423.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408242355090261014.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824235457731525.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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