题目内容
一根长为L的丝线吊着一质量为m的带电量为q的小球静止在水平向右的匀强电场中,如图所示,丝线与竖直方向成37o角,(重力加速度为g),求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241313302172226.png)
小题1:该静止小球带何种电;
小题2:匀强电场的电场强度的大小;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241313302172226.png)
小题1:该静止小球带何种电;
小题2:匀强电场的电场强度的大小;
小题1:正电
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131330249648.png)
(1) 由平衡条件可判断小球带正电。―――(2分)
(2)小球静止在电场中受力如图:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241313302802944.png)
由平衡条件得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131330311844.png)
故
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131330623333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824131330249648.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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