题目内容
静电场方向平行于x轴,其电势φ随x的分布可简化为如图所示的折线,图中φ0和d为已知量,一个质量为m、电荷量为q带负电的粒子恰好在电场中以x = 0为中心、沿x轴方向做周期性运动。忽略粒
子的重力,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048128982310.jpg)
子的重力,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250048128982310.jpg)
A.在-d<x<d区间内的场强大小都是![]() |
B.在-d<x<d区间内粒子做简谐运动 |
C.要使粒子能运动到-d处,粒子在O点的动能至少为![]() |
D.粒子从![]() ![]() |
C
试题分析:电势沿电场线的方向降落,而由题“静电场方向平行于x轴”,故场强方向与电势降落方向一致,即在-d<x<0区间内,电势沿x负方向降落,即场强沿x轴负方向,所以选项A错误;由
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004812976595.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004812991702.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004813007629.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004812945453.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004812960432.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825004813054594.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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