题目内容
不考虑重力作用,从t=0时刻开始,下列各种随时间变化的电场中哪些能使原来静止的带电粒子做单向直线运动( )![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241214065006847.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241214065006847.png)
AC
分析:本题的关键是根据场强度的变化情况分析加速度的变化情况,再分析粒子的运动情况,根据加速度的对称性找到速度为零的时刻,只要粒子的速度方向不改变,粒子就做单一方向的运动。
解答:粒子仅受电场力作用,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406532417.png)
A、由图象可知:在0 -
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406641355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406641355.png)
B、由图象可知:在0 -
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406719297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406641355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406797393.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406641355.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406719297.png)
C、由图象可知:在0 -
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121407046301.png)
D、由图象可知:在0 -
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406719297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406719297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121406578293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121407187334.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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