题目内容
如图所示,匀强电场中有a、b、c三点,在以它们为顶点的三角形中,∠a=30°,∠c=90°.电场方向与三角形所在平面平行.已知a、b和c点的电势分别为(2-
)V、(2+
)V和2 V.该三角形的外接圆上最低、最高电势分别为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033121212126.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312090346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312090346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033121212126.png)
A.(2-![]() ![]() | B.0、4V |
C.![]() ![]() | D.0、2![]() |
B
试题分析:由题意知在匀强电场中a、b和c点的电势分别为(2-
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312090346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312090346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033122307381.png)
上最高、最低的点;b点与oc间的电势差为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312246454.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312261539.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312277750.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312293732.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312308581.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003312324593.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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