题目内容
(8分) 如图所示,两平行金属板A.B间为一匀强电场,A.B相距6cm,C.D为电场中的两点,C点在A板上,且CD=4cm,CD连线和场强方向成60°角.已知电子从D点移到C点电场力做功为3.2×10-17J,电子电量为1.6×10-19C.求:
(1) 匀强电场的场强;
(2) A.B两点间的电势差;
(3) 若A板接地,D点电势为多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013525091899.jpg)
(1) 匀强电场的场强;
(2) A.B两点间的电势差;
(3) 若A板接地,D点电势为多少?
(1)104v/m (2)
(3)-200v
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001352524582.png)
试题分析:(1)电子从D到C电场力做功,则有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013525551533.png)
据匀强电场中电场强度与电势差关系,有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013525711136.png)
(2)A、B间的电势差为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250013525871217.png)
(3)D点电势为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001352618907.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目