题目内容
如图,空间某一区域内存在着相互垂直的匀强电场和匀强磁场,一个带电粒子以某一初速度由A点进入这个区域沿直线运动,从C点离开区域;如果这个区域只有电场,则粒子从B点离开场区;如果这个区域只有磁场,则粒子从D点离开场区;设粒子在上述三种情况下,从A到B点、A到C点和A到D点所用的时间分别是t1、t2和t3,比较t1、t2和t3的大小,则有(粒子重力忽略不计) ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241454200644706.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241454200644706.jpg)
A.t1=t2=t3 | B.t2<t1<t3 |
C.t1=t2<t3 | D.t1=t3>t2 |
C
试题分析:先看
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145420080412.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145420142411.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145420220429.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145420579447.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145420813510.png)
点评:当带电粒子在电磁场中发生偏转时,需要弄清楚粒子受力情况,从而得出在各个方向上的运动性质,
![](http://thumb2018.1010pic.com/images/loading.gif)
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