题目内容
如图所示,在光滑绝缘的水平面上,有一静止在A点质量为
带负电的小球。现加一水平方向的匀强电场使小球由A点运动到B点,电场力做功为W=0.2J,已知AB两点间距离为L=0.1m,电势差为
。
(1)判断匀强电场的场强方向并计算电场强度E的大小和小球的电量q;
(2)计算小球运动的加速度的大小和到达B点时的速率v。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154551562318.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455125555.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455140409.gif)
(1)判断匀强电场的场强方向并计算电场强度E的大小和小球的电量q;
(2)计算小球运动的加速度的大小和到达B点时的速率v。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154551562318.gif)
(1)200V/m; 0.01C (2)2× 103 m/s2 ;20m/s
电场强度方向从右到左(2分)
(3分)
(1分)
(2分)
(2)(8分)
(1分)
(2分)
(3分)
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455172620.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455187416.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455203635.gif)
(2)(8分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455218426.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455234694.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455265508.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115455281711.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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