题目内容
如图所示,在平面直角坐标系中,有方向平行于坐标平面的匀强电场,其中坐标原点O处的电势为0V,点A处的电势为12V,点B处的电势为6V,则电场强度的大小为_____v/m.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434561301890.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434561301890.jpg)
400
取O、A的中点P,则P点的电势为6V,则P、B两点电势相等,连接PB,则PB为等势线,电场线和等势线垂直且指向电势降低的方向,过O点做PB的垂线交PB于D点,则
DO为电场线,由几何知识可知
DO的距离d=0.015m,而
,
,所以
,则电场强度![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434564421058.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143456146169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143456146169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143456255682.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143456318538.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143456396789.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434564421058.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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