题目内容
如图是荷质比相同的a、b两粒子从O点垂直匀强磁场进入正方形区域的运动轨迹,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042417254756.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042417254756.png)
A.a的质量比b的质量大 | B.a带正电荷、b带负电荷 |
C.a在磁场中的运动速率比b的大 | D.a在磁场中的运动时间比b的长 |
C
试题分析:荷质比相同,但不知电量,故不能比较a、b的质量,A错;由左手定则可知,a、b都带负电荷,B错;带电粒子在磁场中由洛仑兹力提供向心力,有
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004241740779.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004241772689.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250042417871009.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004241803645.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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