题目内容
(6分)如图所示,边长为L的正方形区域abcd内存在着匀强电场,质量为m,电荷量为q的带电粒子以速度v0从a点进入电场,恰好从c点离开电场,离开时的速度为v,不计粒子的重力,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535397042298.png)
求:①a、c两点的电势差Uac
②电场强度E的大小?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535397042298.png)
求:①a、c两点的电势差Uac
②电场强度E的大小?
①
②![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153539844993.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535397821031.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153539844993.png)
试题分析:①从a到c由动能定理得到:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153539954970.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241535397821031.png)
②由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153540312671.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153540375394.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824153539844993.png)
点评:学生会分析粒子在运动过程中的受力情况及力的做功情况。
![](http://thumb2018.1010pic.com/images/loading.gif)
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