题目内容
如图所示,在磁感应强度为B的匀强磁场中,有一匝数为N的矩形线圈,其面积为S,电阻为r,线圈两端外接一电阻为R的用电器和一个交流电压表。若线圈绕对称轴OOˊ以角速度ω做匀速转动,则线圈从图示位置转过90°的过程中,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241242035032645.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241242035032645.png)
A.通过电阻的电量为![]() |
B.穿过线圈平面的磁通量的改变量为NBS |
C.交流电压表的示数为![]() |
D.电阻产生的热量为![]() |
AC
A、由
得到,电量q=
.故A正确.
B、从图示位置开始转动90°磁通量的变化量,△Φ=Φ2-Φ1=BS.故B错误.
C、电动势的最大值Em=NBSω,电动势的有效值E=
Em,交流电压表示数U=
E,得到U=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124203956413.png)
.故C正确.
D、电阻R产生的热量Q=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124204424436.png)
=
.故D错误.
故选AC
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124203893974.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124203925609.png)
B、从图示位置开始转动90°磁通量的变化量,△Φ=Φ2-Φ1=BS.故B错误.
C、电动势的最大值Em=NBSω,电动势的有效值E=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124203956413.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124204330420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124203956413.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124204377660.png)
D、电阻R产生的热量Q=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124204424436.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124204439532.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241242044551118.png)
故选AC
![](http://thumb2018.1010pic.com/images/loading.gif)
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