题目内容
(12分)如图所示为两组平行金属板,一组竖直放置,一组水平放置,今有一质量为m的电子静止在竖直放置的平行金属板的A点,经电压U0加速后,通过B点进入两板间距为d、电压为U的水平放置的平行金属板间,最后电子从右侧的两块平行金属板之间穿出,已知A、B分别为两块竖直板的中点,右侧平行金属板的长度为L,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015271702785.jpg)
(1)电子通过B点时的速度大小V
(2) 电子从右侧的两块平行金属板之间穿出时的侧移距离y
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015271702785.jpg)
(1)电子通过B点时的速度大小V
(2) 电子从右侧的两块平行金属板之间穿出时的侧移距离y
1625.75m
试题分析:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001527185814.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015272011067.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001527216648.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001527232447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001527248713.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001527263803.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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