题目内容
如图所示电路中,线圈的自感系数为L,电容器的电容为C,电源的电动势为E.现在把开关S从原来接在1上转换到2,从这时起,至少经历时间为__________,回路中磁场能达到最大;在
周期的时间内,电容器放电的总电荷量是__________,回路中的平均电流是__________.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206570781458.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657016303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241206570781458.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657094646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657156747.png)
开关S接1时,电容器上充电,由于电容器两板间电势差U等于电源电动势E,而电容为C,根据C=
,充电的电荷量Q=CU=CE.
开关S从1转换到2,电容器与线圈组成LC振荡电路,开始放电,经过
个周期的时间放电完毕,电流和磁场能达到最大值,由于周期T=
,时间t=
.
电容器上的电荷量Q=CE,也是放电的总电荷量,根据电流定义
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657188455.png)
开关S从1转换到2,电容器与线圈组成LC振荡电路,开始放电,经过
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657016303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657266594.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657297785.png)
电容器上的电荷量Q=CE,也是放电的总电荷量,根据电流定义
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120657344990.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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