题目内容
如图所示,电场中有A、B两点,则下列说法中正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241324423762072.png)
A、电势
>
,场强EA>EB
B、电势
>
,场强EA<EB
C、将+q电荷从A点移动到B点电场力做正功
D、将-q电荷分别放在A、B两点时具有的电势能EPA>EPB
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241324423762072.png)
A、电势
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132442407387.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132442438388.png)
B、电势
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132442407387.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132442438388.png)
C、将+q电荷从A点移动到B点电场力做正功
D、将-q电荷分别放在A、B两点时具有的电势能EPA>EPB
BC
电场线的疏密表示场强的大小,沿着电场线电势降低。正电荷的受力方向与场强方向相同,位移为电场力间夹角为锐角,电场力做正功。电场力对负电荷做负功,电势能增加。所以答案选BC。
![](http://thumb2018.1010pic.com/images/loading.gif)
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