题目内容
如图所示,粗糙程度均匀的绝缘斜面下方O点处有一正点电荷,带负电的小物体以初速度v1从M点沿斜面上滑,到达N点时速度为零,然后下滑回到M点,此时速度为
。若小物体电荷量保持不变,OM=ON,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039516852284.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003951669563.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039516852284.jpg)
A.小物体上升的最大高度为![]() |
B.从N到M的过程中,小物体的电势能逐渐减小 |
C.从M到N的过程中,电场力对小物体先做正功后做负功 |
D.从N到M的过程中,小物体受到的摩擦力和电场力均是先增大后减小 |
ACD
试题分析:设斜面倾角为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003951731297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003951747627.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039517781433.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039517941476.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003951809943.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039518411031.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003951747627.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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