题目内容
如图所示的匀强电场中,有a、b、c三点,ab间距离Lab=6cm,bc间距离Lbc=10cm,其中ab沿电场方向,bc和电场方向成60°角。一个带电量q=-4×10-8的负电荷从b点移到c点克服电场力做功2×10-6。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019159131271.png)
(1)匀强电场的电场强度为多大;
(2)该电荷从a点移到b点,该电荷的电势能的变化量;
(3)a、c两点间的电势差。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019159131271.png)
(1)匀强电场的电场强度为多大;
(2)该电荷从a点移到b点,该电荷的电势能的变化量;
(3)a、c两点间的电势差。
(1)1000N/C (2)-2.4
J (3)110V
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916069433.png)
试题分析:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019160841194.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916287996.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916303825.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916069433.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916069433.png)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916350753.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001916365776.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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