题目内容
如图所示,水平方向的匀强电场的场强为E,场区宽度为L,紧挨着电场的是垂直纸面向外的两个匀强磁场区域,其磁感应强度分别为B和2B,
三个场的竖直方向均足够长。一个质量为m,电量为q的带正电粒子,其重力不计,从电场的边界MN上的a点由静止释放,经电场加速后进人磁场,穿过中间磁场所用的时间t0=
,进入右边磁场后能按某一路径再返回到电场的边界MN上的某一点b,途中虚线为场区的分界面。求:
(1)中间场区的宽度d;
(2)粒子从a点到b点所经历的时间t;
(3)当粒子第n次返回电场的MN边界时与出发点之间的距离Sn。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223171195740.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412231708865.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317103446.gif)
(1)中间场区的宽度d;
(2)粒子从a点到b点所经历的时间t;
(3)当粒子第n次返回电场的MN边界时与出发点之间的距离Sn。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241223171195740.jpg)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317135670.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317150840.gif)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317166909.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317135670.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317150840.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122317166909.gif)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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