题目内容
AB是某电场中的一条电场线,若将一负电荷从A点处自由释放,负电荷从A点沿电场线运动到B点,速度图线如图所示.则A、B两点电势高低和场强的大小关系是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241445310671956.jpg)
A.
>
EA>EB B.
>
EA<EB
C.
<
EA>EB D.
<
EA<EB
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241445310671956.jpg)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531098385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531145379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531098385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531145379.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531098385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531145379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531098385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144531145379.png)
C
试题分析:电子从A点运动到B点,由图象知斜率越来越小,加速度越来越小,电子受到电场力越来越小,场强也越来越小,从A到B速度增大,动能增大,电势能减小,负电荷电势高处电势能低,C对
点评:明确电场线与电势的关系、电场力与速度的关系
![](http://thumb2018.1010pic.com/images/loading.gif)
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