题目内容
在匀强电场中有a、b、c三点,如图所示,ab=5cm,ac=3cm,bc=4cm,已知Uac=12V, E=400N/C,则场强方向应是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241322260781290.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241322260781290.png)
A.由a向c | B.由b向c |
C.由a向b | D.由c向b |
A
由场强计算公式
可知,
,代入数据可得:
,则
,即场强方向与ac方向平行,由
,即
,故场强方向是由a指向c,选择A选项。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132226110790.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132226328777.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132226359469.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132226390379.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132226422781.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132226468485.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.由a向c | B.由b向c |
C.由a向b | D.由c向b |