题目内容
交流发电机矩形线圈边长ab=cd=0.4 m,bc=ad=0.2 m,共50匝,线圈电阻r=1 Ω,线圈在B=0.2 T的匀强磁场中,绕垂直磁场方向的轴OO′以
r/s转速匀速转动,外接电阻9 Ω,如图3-2-18所示.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207290582613.jpg)
图3-2-18
(1)电压表读数;
(2)电阻R上电功率.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120729043456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207290582613.jpg)
图3-2-18
(1)电压表读数;
(2)电阻R上电功率.
(1)101.5 V (2)1152 W
(1)线圈在磁场中产生:
=NBSω
=50×0.2×0.4×0.2×
×2 π
=160 V
I=![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207291361448.png)
U=IR=72
≈101.5 V
(2)P=UI=72
×8
=1152 W
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120729074418.png)
=50×0.2×0.4×0.2×
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120729043456.png)
=160 V
I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241207291361448.png)
U=IR=72
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120729168336.png)
(2)P=UI=72
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120729168336.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120729168336.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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