题目内容
如图所示,边长为L的正方形线圈abcd与阻值为R的电阻组成闭合回路,abcd的匝数为n、总电阻为r,ab中点、cd中点的连线OO/恰好位于匀强磁场的左边界线上,磁场的磁感应强度大小为B。从图示位置开始计时,线圈绕垂直于磁场的
轴以角速度
匀速转动,则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349588869710.png)
A.回路中感应电动势的瞬时表达式e = nBωL2 sinωt
B.在t =
时刻,穿过线圈的磁通量为零,磁通量变化率最大
C.从t ="0" 到t =
时刻,电阻R产生的焦耳热为Q = ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349590261340.png)
D.从t ="0" 到t =
时刻,通过R的电荷量q = ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134959244800.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134958683414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134958839359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349588869710.png)
A.回路中感应电动势的瞬时表达式e = nBωL2 sinωt
B.在t =
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134958932560.png)
C.从t ="0" 到t =
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134958932560.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349590261340.png)
D.从t ="0" 到t =
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134958932560.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134959244800.png)
BC
感应电动势峰值为
,瞬时值表达式为
,A错;当t =
,线圈转过90°,磁通量为零,但磁通量的变化率最大,B对;电压有效值为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349594941277.png)
,C对;电荷量
,D错;
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349592911321.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349593541080.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134958932560.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349594941277.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349590261340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241349596502608.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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