题目内容
如图所示,两块平行、正对的金属板水平放置,分别带有等量的异种电荷,使两板间形成匀强电场,两板间的距离为d。有一带电粒子以某个速度v0紧贴着A板左端沿水平方向射入匀强电场,带电粒子恰好落在B板的右边缘。带电粒子所受的重力忽略不计。现使该粒子仍从原位置以同样的方向射入电场,但使该粒子落在B板的中点,下列措施可行的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030062471834.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030062471834.jpg)
A.仅使粒子的初速度变为2v0 |
B.仅使粒子的初速度变为![]() |
C.仅使B板向上平移![]() |
D.仅使B板向下平移d |
B
试题分析:带电粒子在垂直电场方向做匀速直线运动,位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006309492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250030063251131.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006340987.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006372266.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006387338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006262434.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006294433.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006434818.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006465571.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006387338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003006387338.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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