题目内容
如图为某一平面内非匀强电场的等势线分布图,已知相邻的等势线间的电势差大小相等,其中A、B两点电势分别为
,
。请完成以下问题:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415243968217304.png)
(1)大致画出一条经过B点的电场线(至少过三条等势线)
(2)比较A、B两点电场强度的大小。
(3)若将一电子从A点沿某一路径运动到B点,则电子的电势能如何变化?变化了多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152439386578.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152439495546.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415243968217304.png)
(1)大致画出一条经过B点的电场线(至少过三条等势线)
(2)比较A、B两点电场强度的大小。
(3)若将一电子从A点沿某一路径运动到B点,则电子的电势能如何变化?变化了多少?
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415243991617481.png)
(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152440306763.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415243991617481.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152440119531.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152440306763.png)
试题分析:(6分)(1)如图 (1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415243991617481.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152440119531.png)
(3)电场力做负功,电势能增加, (1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241524407121441.png)
增加了
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152440306763.png)
点评:难度较小,理解电势高低与场强或电场线的关系,在利用W=qU计算电场力做功时要注意字母的下角标
![](http://thumb2018.1010pic.com/images/loading.gif)
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