题目内容
如图,在直角坐标系x
y内,有一个质量为m,电荷量为
的电荷从原点
沿x轴正方向以初速度为
射出,电荷重力不计。现要求该电荷能通过点
,试设计在电荷运动的空间范围内加上某种“场”后并运用物理知识求解的一种简单、常规的方案。说明电荷由
到
的运动性质并在图中绘出电荷运动的轨迹;要有必要的运算说明你设计的方案中相关的物理量的表达式(用题设已知条件和有关常数表示)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241254569993398.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125455985209.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125456001216.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125455985209.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125456375205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125456516323.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125455985209.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125456609202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241254569993398.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125457015593.gif)
在空间中加一个沿
轴负方向的匀强电场-----(3分);
画图-(2分)
-----(1分);
-----(1分)
由上得:
-----(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125457062193.gif)
画图-(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125457124412.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125457140635.gif)
由上得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125457015593.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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