题目内容
(10分)如图所示,以AB为界的两匀强磁场,磁感应强度
,方向垂直纸面向里。现有一质量为m、带电量为q的带正电粒子,从O点沿图示方向进入
中。
(1)试画出粒子的运动轨迹
(2)求经过多长时间粒子重新回到O点?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306007343047.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600671520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600703337.png)
(1)试画出粒子的运动轨迹
(2)求经过多长时间粒子重新回到O点?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306007343047.png)
(1)见解析(2)
(
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600812968.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600843697.png)
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306008748829.jpg)
(2)在B1中:
(2分)
在B2中:
(2分)
(
) (1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306008748829.jpg)
(2)在B1中:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600905897.png)
在B2中:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241306009521163.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600812968.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130600843697.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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