题目内容
在真空中存在空间范围足够大的、水平向右的匀强电场.若将一个质量为m、带正电电量q的小球在此电场中由静止释放,小球将沿与竖直方向夹角为
的直线运动。现将该小球从电场中某点以初速度
竖直向上抛出,求(取![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542474474.gif)
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255425527035.jpg)
小题1:小球受到的电场力的大小;
小题2:小球抛出点至最高点之间的电势差U.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542364227.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542380205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542474474.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542520474.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255425527035.jpg)
小题1:小球受到的电场力的大小;
小题2:小球抛出点至最高点之间的电势差U.
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542567706.gif)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542583589.gif)
(1)根据题设条件,电场力大小
(5分)
(10分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542567706.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412554311320459.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125542583589.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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