题目内容
如图所示,在第二象限内有水平向右的匀强电场,电场强度为E,在第一、第四象限内分别存在如图所示的匀强磁场,磁感应强度大小相等. 有一个带电粒子以初速度v0垂直x轴,从x轴上的P点进入匀强电场,恰好与y轴成45°角射出电场,再经过一段时间又恰好垂直于x轴进入下面的磁场.已知OP之间的距离为d,则带电粒子( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035288718916.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035288718916.png)
A.在电场中运动的时间为![]() |
B.在磁场中做圆周运动的半径为![]() |
C.自进入磁场至第二次经过x轴所用时间为![]() |
D.自进入电场至在磁场中第二次经过x轴的时间为![]() |
AD
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500352894919392.png)
试题分析:带电粒子在匀强电场中做类平抛运动,水平方向做匀加速直线运动,竖直方向做匀速直线运动,出电场时与y轴成45°角,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003528965704.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003528980711.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003529136974.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003529167821.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003529183678.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003529199767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250035292141554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003529230839.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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