题目内容
下图1是某同学设计的电容式速度传感器原理图,其中上板为固定极板,下板为待测物体,在两极板间电压恒定的条件下,极板上所带电量Q将随待测物体的上下运动而变化,若Q随时间t的变化关系为Q=
(a、b为大于零的常数),其图象如图2所示,那么图3、图4中反映极板间场强大小E和物体速率v随t变化的图线可能正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636525598187.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163652262501.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241636525598187.jpg)
A.①和③ | B.①和④ | C.②和③ | D.②和④ |
C
试题分析:电容式速度传感器原理图,其中上板为固定极板,下板为待测物体,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163652590539.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163652886820.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163653198599.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824163653510656.png)
故选:C
点评:运用各公式去寻找变量间的关系,最终得出正确答案.
![](http://thumb2018.1010pic.com/images/loading.gif)
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