题目内容
如图7所示,质量为m、电荷量为q的带电液滴从h高处自由下落,进入一个互相垂直的匀强电场和匀强磁场区域,磁场方向垂直于纸面,磁感应强度为B,电场强度为E.已知液滴在此区域中做匀速圆周运动,则圆周运动的半径r为 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241414002811564.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241414002811564.jpg)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
AC
液滴进入复合场的速度v=
,液滴在重力、电场力、洛伦兹力作用下做匀速圆周运动,满足mg=qE,qvB=m
,可得A、C选项正确.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141400531533.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824141400905424.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |