题目内容
如图所示,两个互相连接的金属环用同样规格的导线制成,大环半径是小环半径的4倍,若穿过大环的磁场不变,小环中磁场变化率为k时,其路端电压为U;若小环中磁场不变,而大环中磁场变化率也为k时,其路端电压为____________.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425123772277.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425123772277.jpg)
4U
根据题意设小环电阻为R,则大环电阻为4R,小环的面积为S,大环的面积为16S,且![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142512533644.png)
当小环磁场发生变化时,小环相当于电源,大环是外电路,
感应电动势![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425125961036.png)
则路端电压![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425127361100.png)
当大环磁场发生变化时,大环相当于电源,小环是外电路,感应电动势E2为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425129391290.png)
则U′=
则U′=4U.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142512533644.png)
当小环磁场发生变化时,小环相当于电源,大环是外电路,
感应电动势
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425125961036.png)
则路端电压
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425127361100.png)
当大环磁场发生变化时,大环相当于电源,小环是外电路,感应电动势E2为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425129391290.png)
则U′=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142513142993.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目