题目内容
如图所示,xOy平面内有一匀强电场,场强为
,方向未知,电场线跟
轴的负方向夹角为
,电子在坐标平面
内,从原点O以大小为
、方向沿
正方向的初速度射入电场,最后打在
轴上的
点.电子的质量为
,电荷量为
,重力不计.则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500243150110676.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431283318.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431299266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431314297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431361413.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431377323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431299266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431408310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431439399.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431470337.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431486264.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500243150110676.png)
A.O点电势高于![]() |
B.运动过程中电子在![]() |
C.运动过程中,电子的电势能先减少后增加 |
D.电场对电子先做负功,后做正功 |
D
试题分析:电子沿
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431299266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431439399.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002431439399.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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