某介质的相对电容率,击穿电场强度为
,如果用它来作平板电容器的电介质,要制作电容为0.047μF,而耐压为4.0kV的电容器,它的极板面积至少要多大.
正确答案:
介质内电场强度![](https://img.274949.com/Images/2020-04/04/rccejocf.jpg)
电容耐压Um=4.0kV,因而电容器极板间最小距离![](https://img.274949.com/Images/2020-04/04/e111im83.jpg)
要制作电容为0.047μF的平板电容器,其极板面积![](https://img.274949.com/Images/2020-04/04/9h3qpulk.jpg)
![](https://img.274949.com/Images/2020-04/04/rccejocf.jpg)
电容耐压Um=4.0kV,因而电容器极板间最小距离
![](https://img.274949.com/Images/2020-04/04/e111im83.jpg)
要制作电容为0.047μF的平板电容器,其极板面积
![](https://img.274949.com/Images/2020-04/04/9h3qpulk.jpg)
答案解析:有
![](/editor/images/201705/qrcode_for_gh_573e2a458573_258.jpg)
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某介质的相对电容率,击穿电场强度为
,如果用它来作平板电容器的电介质,要制作电容为0.047μF,而耐压为4.0kV的电容器,它的极板面积至少要多大.
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