题目内容
(12分)一荷质比为
的带电粒子经一电场U=150V加速进入到一只有左边界的匀强磁场中,已知匀强磁场的磁感应强度为B="0.1T" 求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009368717775.jpg)
(1)粒子离开电场时的速度
(2)粒子离开磁场左边界的位置距离进入点的长度
(3)粒子在磁场中运动的时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000936855982.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009368717775.jpg)
(1)粒子离开电场时的速度
(2)粒子离开磁场左边界的位置距离进入点的长度
(3)粒子在磁场中运动的时间
(1)
(2)2m (3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000936918584.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000936887673.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000936918584.png)
试题分析:(1)由动能定理
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000936933793.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009369491152.png)
(2)粒子在磁场中做圆周运动由洛伦兹力提供向心力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000936980747.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000937074438.png)
粒子离开磁场时距离进入点的长度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000937089586.png)
(3)粒子在磁场中运动的周期
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250009371051151.png)
粒子在磁场中运动的时间
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000937121834.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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