题目内容
(15分)如图所示,光滑绝缘水平桌面上的A、B、C三点是等腰直角三角形的三个顶点,AD为三角形的高,∠BAC=90°,BC=0.8m,空间存在方向与BC平行的匀强电场.将质量为
、电荷量为
的小球由A点移到B点,电势能增加
.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052481767484.jpg)
(1)匀强电场的场强大小;
(2)A、B两点间的电势差UAB;
(3)将小球从B处静止释放,运动到C处时的动能.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248129735.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248145563.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248160393.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052481767484.jpg)
(1)匀强电场的场强大小;
(2)A、B两点间的电势差UAB;
(3)将小球从B处静止释放,运动到C处时的动能.
(1)
(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248223584.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248192628.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248207445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248223584.png)
试题分析:(1)由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248238643.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248254775.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052482701863.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005248285995.png)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052483011001.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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