题目内容
某电场的电场线分布如图所示,关于电场中A、B两点的场强,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241543212784693.jpg)
A.
= ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321465394.png)
B.
< ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321465394.png)
C.
> ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321465394.png)
D.
点与
点的电场强度方向相同
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241543212784693.jpg)
A.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321356388.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321465394.png)
B.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321356388.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321465394.png)
C.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321356388.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154321465394.png)
D.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154322151300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154322338309.png)
B
试题分析:电场强度的大小可以根据电场线的疏密判断,电场线越密,场强越大,与试探电荷的电荷量无关.电场强度的方向沿电场线的切线方向.由图看出,B点处电场线比A点处电场线密,则场强B点场强大于A点场强.故B正确,故选B.
点评:电场强度的定义式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154322401434.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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