题目内容
如图为交流发电机的示意图.正方形线框处于匀强磁场中,已知边长L=10cm,磁感应强度B=1T,线圈匝数n=100,线圈电阻r=5
,外电路负载电阻R=5
,线圈以10r/s的转速匀速转动.从图示位置开始计时,两块电表均为理想电表。(无理数一律保留原形,不必求值!)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241557461123155.jpg)
(1)写出该发电机产生的电动势的瞬时值e的表达式;
(2)求电流表示数I和电压表示数U.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155745925333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155745925333.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241557461123155.jpg)
(1)写出该发电机产生的电动势的瞬时值e的表达式;
(2)求电流表示数I和电压表示数U.
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155746330520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241557461431193.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155746330520.png)
试题分析:(1)ω=20πrad/s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241557461431193.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241557466582617.png)
点评:解决本题的关键掌握线圈转动产生电动势的瞬时表达式,以及知道电动势峰值的公式.
![](http://thumb2018.1010pic.com/images/loading.gif)
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