题目内容
如图所示,实线为一匀强电场的电场线,两个带电粒子甲和乙分别从A、C两点以垂直于电场线方向的相同大小的初速度
同时射入电场,粒子在电场中仅受电场力作用,其运动轨迹分别为图中虚线ABC与CDA所示.若甲是带正电的粒子,则下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040547716843.png)
A.乙也是带正电的粒子 B.A点的电势低于C点的电势
C.甲乙两粒子的电势能均减小 D.甲乙两粒子的电量一定相等
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004054740323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250040547716843.png)
A.乙也是带正电的粒子 B.A点的电势低于C点的电势
C.甲乙两粒子的电势能均减小 D.甲乙两粒子的电量一定相等
C
试题分析:甲乙两粒子均在匀强电场中做曲线运动,根据合外力指向轨迹的凹侧,甲粒子带正电受电场力向右,则电场线向右;乙粒子受电场力向左,故带负电,选项A错误.沿着电场线的电势逐渐降低,可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004054787524.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004054802558.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004054818818.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004054833415.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004054849451.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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