题目内容
喷墨打印机的简化模型如图所示,重力可忽略的墨汁微滴,经带电室带负电后,以速度
垂直匀强电场飞入极板间,最终打在纸上,则微滴在极板间电场中( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029191508151.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002919135265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250029191508151.png)
A.电势能逐渐增大 |
B.运动轨迹是抛物线 |
C.运动轨迹与初速度![]() |
D.运动轨迹与带电量无关 |
B
试题分析: 由于电子做正功,故电势能减少,A错误;由于电子在电场中做类平抛运动,轨迹为抛物线,故B正确;由侧向位移y=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002919181544.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002919197887.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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