题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411562729010711.jpg)
(1)加速电压U1;
(2)圆柱形磁场的最小横截面积;
(3)粒子从o点到p点所用时间
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627321579.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627337784.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241156273522546.jpg)
(1)粒子经加速电场后,速度为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627368205.gif)
(2分)
粒子在正交电磁场区域,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627399475.gif)
得到
(1分)
得
(1分)
(2)由
得
(2分)
圆柱形磁场半径为
° (1分)
圆柱形磁场最小横截面为
(2分)
(3)粒子圆周运动周期
(2分)
粒子经直线、弧线、又直线运动到p所用时间
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627368205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627383550.gif)
粒子在正交电磁场区域,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627399475.gif)
得到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627415446.gif)
得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627321579.gif)
(2)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627446593.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627461520.gif)
圆柱形磁场半径为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627477351.gif)
圆柱形磁场最小横截面为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627337784.gif)
(3)粒子圆周运动周期
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115627508517.gif)
粒子经直线、弧线、又直线运动到p所用时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241156275241552.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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