题目内容
三个点电荷电场的电场线分布如图所示,图中a、b两点出的场强大小分别为
、
,电势分别为
,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414112534212059.png)
A
>
,
>
B
<
,
<![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125716394.png)
C
>
,
<
D
<
,
>![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125716394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125061390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125155392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125217520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414112534212059.png)
A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125061390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125155392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125670392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125716394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125061390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125155392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125670392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125716394.png)
C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125061390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125155392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125670392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125716394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125061390.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125155392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125670392.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141125716394.png)
C
磁感线的疏密程度表示场强大小,沿电场线方向电势逐渐降低,C对;
电场线密的地方电场强度大,电场线稀的地方电场强度小,沿电场线电势降低,据此可正确解答本题.
解:电场线密的地方电场强度大,电场线稀的地方电场强度小,故Ea>Eb;根据电场线与等势线垂直,在b点所在电场线上找到与a点电势相等的,依据沿电场线电势降低,可知φa<φb,故ABD错误,C正确.
故选C.
电场线密的地方电场强度大,电场线稀的地方电场强度小,沿电场线电势降低,据此可正确解答本题.
解:电场线密的地方电场强度大,电场线稀的地方电场强度小,故Ea>Eb;根据电场线与等势线垂直,在b点所在电场线上找到与a点电势相等的,依据沿电场线电势降低,可知φa<φb,故ABD错误,C正确.
故选C.
![](http://thumb2018.1010pic.com/images/loading.gif)
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