题目内容
电阻为1Ω的矩形线圈,绕垂直于磁场方向的轴在匀强磁场中匀速转动,产生的交变电动势随时间变化的图象如图所示。现把交流电加在电阻为9Ω的电热丝上,则下列说法中正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026293607961.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026293607961.png)
A.线圈转动的角速度为100πrad/s |
B.电热丝两端的电压U=100![]() |
C.如果线圈转速提高一倍,则电流不会改变 |
D.用电流表测量电热丝的值为20A |
A
试题分析:有图像可得交流电变化的周期
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629391519.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629422780.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250026294381113.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629469623.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629484445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629500472.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629531902.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629562753.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629578773.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825002629594308.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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