题目内容
如图所示,在地面上方的真空室内有相互垂直的匀强电场和匀强磁场,匀强电场的方向指向Y轴的负方向,场强E=4.0×
V/m,匀强磁场的方向指向X轴的正方向,磁感强度B=0.40T.现有一带电微粒m以200m/s的速度由坐标原点沿Y轴正方向射入真空室后立即做匀速圆周运动.从微粒由O点射入开始计时,求经时间
时微粒所处位置的坐标.(g取10/
)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752201511.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752154119.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752169250.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752185102.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752201511.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752216685.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115752232671.gif)
微粒进入电磁复合场后做匀速圆周运动,所受重力mg="qE" ①
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241157522474251.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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