题目内容
如图所示,是研究平行板电容器电容的实验装置,其中极板A接地,极板B与静电计相接,静电计外壳也接地。在实验中,若将A极板稍向左移动一些,增大电容器两极板间的距离,电容器所带的电量可视为不变,这时可观察到静电计金属箔张角会变大,这说明电容器的电容______;两极板间的距离增大后,两极板间的电场强度__________。(填“变大”、“变小”或“不变”) ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414534192212722.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414534192212722.png)
变小 不变
试题分析:根据电容器的决定式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145341969810.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342078571.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342125592.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241453421721244.png)
点评:偏易。在“电量Q不变”的这种情况中,我们推导出的公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342312920.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342374625.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342437490.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342530428.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342577429.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145342577429.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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