题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115503954234.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155039543256.jpg)
该粒子从ab边射出,距a点距离![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115503970465.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115503970465.gif)
从原点沿x轴直线射出过程匀速直线运动,受力平衡:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155039862979.gif)
①
当撒去电场,在匀强磁场中匀速圆周运动,如图所示,设半径为r
在
内有:
②
③
若撤去磁场,只保留电场,带电粒子向上偏转,做类平抛运动,从f点射出:
④
⑤
⑥
由①②③④⑤式得:
⑦
该粒子从ab边射出,距a点距离![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115503970465.gif)
评分参考:①③④⑤⑥式分别得3分,②⑦式得2分
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155039862979.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504001428.gif)
当撒去电场,在匀强磁场中匀速圆周运动,如图所示,设半径为r
在
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504017331.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504032676.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504173556.gif)
若撤去磁场,只保留电场,带电粒子向上偏转,做类平抛运动,从f点射出:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504204453.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504344525.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504407253.gif)
由①②③④⑤式得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115504422504.gif)
该粒子从ab边射出,距a点距离
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115503970465.gif)
评分参考:①③④⑤⑥式分别得3分,②⑦式得2分
![](http://thumb2018.1010pic.com/images/loading.gif)
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