题目内容
如图为回旋加速器的装置图,D型盒的两底边分别为a、b,且相距很近,忽略粒子在其间的运动时间,设D型盒中的匀强磁场的磁感应强度为B,D型盒的半径为R,质量为m带电量为q的正电荷在a的中点从静止释放,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511415692502.jpg)
(1)带电粒子出回旋加速器时的动能
(2)从带电粒子开始运动开始计时,画出Uab一个周期内随时间t变化的图像(横轴用已知量标出)
(3)如果ab间的电压值始终保持为U,带电粒子从静止开始运动到出加速器所用的时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511415692502.jpg)
(1)带电粒子出回旋加速器时的动能
(2)从带电粒子开始运动开始计时,画出Uab一个周期内随时间t变化的图像(横轴用已知量标出)
(3)如果ab间的电压值始终保持为U,带电粒子从静止开始运动到出加速器所用的时间
(1)
(2)见解析(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141740792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141584950.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141740792.png)
试题分析:(1)由:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141803766.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141927764.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141584950.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151142161183.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511423021875.jpg)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141584950.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241511424111009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151141740792.png)
点评:做本题的关键是理解回旋加速度器的工作原理
![](http://thumb2018.1010pic.com/images/loading.gif)
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