题目内容
(14分)如图所示
的矩形线圈,ab = 40cm,ad = 20cm,共50匝,在B = 0.6T的匀强磁场中以
的速度绕中心轴OO¢匀速转动,当
时线圈平面与磁场垂直.
(1)写出感应电动势瞬时值的表达式.并求出当
秒时感应电动势的瞬时值.
(2)若线圈的电阻为10Ω,为了使线圈匀速转动,每秒要提供的机械能是多少?(不考虑一切摩擦)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241213317903617.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412133172885.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331744328.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331759227.gif)
(1)写出感应电动势瞬时值的表达式.并求出当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331775293.gif)
(2)若线圈的电阻为10Ω,为了使线圈匀速转动,每秒要提供的机械能是多少?(不考虑一切摩擦)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241213317903617.gif)
(1)
;E = 24
(v)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332009447.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331884452.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331993185.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332009447.gif)
(1)
,
= 2
f
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332134714.gif)
当t = 0.025s,E = 24
(v),
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332227381.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332258719.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332024678.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332102192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331993185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332134714.gif)
当t = 0.025s,E = 24
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121331993185.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332212439.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332227381.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121332258719.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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