题目内容
如图11-43所示,直角坐标系中的第Ⅰ象限中存在沿y轴负方向的匀强电场,在第Ⅱ象限中存在垂直纸面向外的匀强磁场.一电荷量为q、质量为m的带正电的粒子,在-x轴上的点a以速率v0、方向和-x轴方向成60°射入磁场,然后经过y轴上y=L处的 b点垂直于y轴方向进入电场,并经过x轴上x=2L处的c点.不计重力.求
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241209538422076.jpg)
图11-43
(1)磁感应强度B的大小;
(2)电场强度E的大小;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241209538422076.jpg)
图11-43
(1)磁感应强度B的大小;
(2)电场强度E的大小;
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953874474.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953858475.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953874474.gif)
(1)带电粒子在磁场中运动由轨迹可知r=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953889255.gif)
由qv0B=
得B=
.
(2)带电粒子在电场中运动2L=v0t2
L=
解得E=
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953889255.gif)
由qv0B=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953905408.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953920484.gif)
(2)带电粒子在电场中运动2L=v0t2
L=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953936414.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953936447.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120953952476.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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