题目内容
如图所示,质量为
、电荷量为
的带电小球拴在一不可伸长的绝缘轻细绳一端,绳的另一端固定于
点,绳长为
。现加一个水平向右的匀强电场,小球静止于与竖直方向成
角的A点。已知重力加速度为
。求:
小题1:所加电场的场强E的大小;
小题2:若将小球拉起至与
点等高的B点后无初速释放,则小球经过最低点C时,绳对小球拉力的大小。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527747204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527763212.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527778207.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527794182.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527810270.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527825204.gif)
小题1:所加电场的场强E的大小;
小题2:若将小球拉起至与
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527778207.gif)
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255278561050.jpg)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255278721287.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412552788815475.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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