题目内容
如图所示,导休框架中有一匀强磁场垂直穿过,磁感应强度B=0.2T,电阻R1=R2=1Ω,可动导体的电阻为0.5Ω,导体框的电阻不计,AB长度为0.5m,当AB以10m/s的速度匀速移动的过程中,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241915331005195.jpg)
(1)AB两端的电压为多少?
(2)所需外力的大小为多少?
(3)外力的功率为多少瓦?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241915331005195.jpg)
(1)AB两端的电压为多少?
(2)所需外力的大小为多少?
(3)外力的功率为多少瓦?
(1)0.5V (2)0.1N (3)1W
试题分析:(1)AB在运动过程中产生的感应电动势为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191533115636.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241915335521407.png)
(2)通过AB的感应电流为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191533942659.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191534192694.png)
(3)根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191534441458.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191534769514.png)
点评:需要注意AB两端的电压是路端电压,基础题,比较简单
![](http://thumb2018.1010pic.com/images/loading.gif)
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