题目内容
带电粒子仅在电场力作用下,从电场中
点以初速度
进入电场,沿虚线所示的轨迹运动到
点,
点为轨迹的最左端,如图所示,则粒子在从
点运动到
点过程中,下列判断中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028523185157.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852193283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852225323.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852240249.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852271299.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852193283.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852240249.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250028523185157.jpg)
A.粒子的加速度在![]() |
B.粒子在![]() |
C.粒子在![]() ![]() |
D.粒子一定带正电,动能先变小后变大 |
D
试题分析:电场线密的地方电场的强度大,粒子在c点场强最大,电场力最大,加速度最大,所以A错误;粒子运动轨迹弯向所受电场力的一侧,由粒子的运动的轨迹可以判断粒子带正电,沿着电场线的方向运动时,电场力做正功,电势能减小,逆着电场线方向运动时,电场力做负功,电势能增大,所以粒子在b点时的电势能最大,在
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852240249.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002852271299.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目