题目内容
如图所示,一带电粒子以速度v垂直于场强方向沿上板边缘射入匀强电场,刚好贴下边缘飞出,已知产生场强的金属板长为L,如果带电粒子的速度为2v 时,当它的竖直位移等于板间距d时,它的水平射程x为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025148853170.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025148853170.jpg)
A.1.5L | B.2L | C.2.5L | D.3L |
C
试题分析:带电粒子以速度v垂直于场强方向沿上板边缘射入电场时有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002514901962.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025149321189.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250025149473438.jpg)
由三角形相似得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002514963743.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002515057580.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002515072511.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.1.5L | B.2L | C.2.5L | D.3L |