题目内容
两个长为L的平板板电容器,相距为d,极板间的电势差为U,板间电场可以认为是均匀的。一个
粒子从正极板边缘以某一初速度垂直于电场方向射入两极板之间,到达负极板时恰好落在极板中心。已知
粒子电荷为2e,质量均为m,忽略重力和空气阻力的影响,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241222545611840.jpg)
(1)极板间的电场强度E;
(2)
粒子在极板间运动的加速度a;
(3)
粒子的初速度v0。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254405201.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254405201.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241222545611840.jpg)
(1)极板间的电场强度E;
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254405201.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254405201.gif)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254608418.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254624502.gif)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254639642.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254608418.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254624502.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254639642.gif)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254670591.gif)
(3)带电粒子做平抛运动:
;
解得:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254639642.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254608418.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254670591.gif)
(3)带电粒子做平抛运动:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254686468.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254702423.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122254639642.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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