题目内容
如图所示,光滑绝缘轨道ABP竖直放置,其轨道末端切线水平,在其右侧有一正交的匀强电场、磁场区域,电场竖直向上,磁场垂直纸面向里.一带电小球从轨道上的A点由静止滑下,经P点进入场区后,恰好沿水平方向做直线运动.则可判定( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017318763047.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017318763047.jpg)
A.小球带负电 |
B.小球带正电 |
C.若小球从B点由静止滑下,进入场区后将立即向上偏 |
D.若小球从B点由静止滑下,进入场区后将立即向下偏 |
BD
试题分析:A点由静止滑下进入正交的电磁场时做直线运动,重力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731876414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731892414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731907449.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731939748.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731892414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731907449.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001731985775.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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