题目内容
如图所示,相距L和平行界面
将空间分为Ⅰ、Ⅱ、Ⅲ三个区域,区域Ⅰ和Ⅱ内是垂直纸面、指向读者的匀强磁场,磁感强度分别为
,区域Ⅲ内是匀强电场,电场强度为E,方向从
垂直指向
.现使质量为m、电量为q的带正电粒子以垂直界面的速度
自O点向
射出(O点与
相距
),若粒子所受的重力可以略而不计.为了使正电粒子能按图示的实线轨道运动 (轨道的两段圆弧半径相等)求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158026991531.gif)
(1)磁感强度
之比应是多少?
(2)电场强度E的值应小于多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802138183.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802169187.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802247111.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802263109.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802278108.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802263109.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802263109.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802668128.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158026991531.gif)
(1)磁感强度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802169187.gif)
(2)电场强度E的值应小于多少?
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802777576.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158027311020.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115802777576.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241158029023348.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目