题目内容
电量为q质量为m的负粒子,由静止从电场边界上O点进入如图所示的电场、磁场,电场强度为E,磁感强度为B,电场宽度为L,磁场足够大。(不计带电粒子重力)
1)求带电粒子从O点出发后第一次到达电磁场边界时的速度;
2)求带电粒子从O点出发后到第二次到达电磁场边界时的时间;
3)求带电粒子从O点出发后到第三次到达电磁场边界过程中经过的路程;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234074537408.gif)
2)求带电粒子从O点出发后到第二次到达电磁场边界时的时间;
3)求带电粒子从O点出发后到第三次到达电磁场边界过程中经过的路程;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412340750011075.jpg)
(1)
,解得
(3分)
(2)在电场中:
,(2分);在磁场中:
,(2分)
(1分)
(3)在电场中:
(2分);在磁场中:
(2分)
(1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407515544.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407531574.gif)
(2)在电场中:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407546590.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407562492.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407578861.gif)
(3)在电场中:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407593274.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407609869.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123407624869.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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