题目内容
(16分)如图所示,NM的上侧有匀强磁场,磁场方向垂直于纸面向里,磁感应强度的大小为B。一带负电的粒子(不计重力)从P处以垂直于MN的初速度
射入磁场区域,最后通过
点。已知此粒子的比荷
,求:
(1)P
间的距离L?
(2)粒子从P运动到
需要多长的时间?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241217590505765.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121758972204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121758988216.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759003426.gif)
(1)P
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121758988216.gif)
(2)粒子从P运动到
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121758988216.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241217590505765.jpg)
(1)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759066479.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759081420.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759066479.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759081420.gif)
(1)L=2
…………(2分)
…………(4分)
得
…………(2分)
(2)粒子从
到
运动的时间
…………(2分)
………(4分)
得
………(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759097185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759112493.gif)
得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759066479.gif)
(2)粒子从
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759144202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121758988216.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759175272.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759190526.gif)
得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121759081420.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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