题目内容
有一匀强电场的场强为40N/C,在同一条电场线上有A、B两点,把质量为2×10-9kg,带电荷量为-1.5×10-8C的微粒从A点移到B点,电场力做1.5×10-6J的正功.求:
(1)A、B两点间电势差UAB是多少?
(2)A、B两点间距离是多少?
(3)若微粒在A点具有与电场线同向的速度10m/s,在只有电场力作用的情况下,求经过B点的速度?
(1)A、B两点间电势差UAB是多少?
(2)A、B两点间距离是多少?
(3)若微粒在A点具有与电场线同向的速度10m/s,在只有电场力作用的情况下,求经过B点的速度?
(1)
(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225617679.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225586445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225602474.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225617679.png)
试题分析:(1)由电场力做功的公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225633598.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032256491004.png)
(2)由匀强电场中的场强公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225664592.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225680923.png)
(3)若微粒只在电场力作用下运动,由动能定理得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225695208.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003225617679.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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