题目内容
(15分)如图所示,水平U形光滑框架,宽度为1m,电阻忽略不计,导体ab质量是0.2kg,电阻是0.1
,匀强磁场的磁感应强度B=0.1T,方向垂直框架向上,现用1N的外力F由静止拉动ab杆,当ab的速度达到1m/s时,
(1)求此时刻ab杆产生的感应电动势的大小;
(2)求此时刻ab杆的加速度的大小?
(3)ab杆所能达到的最大速度是多少?![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434013742022.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143401328310.png)
(1)求此时刻ab杆产生的感应电动势的大小;
(2)求此时刻ab杆的加速度的大小?
(3)ab杆所能达到的最大速度是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434013742022.png)
(1)0.1V (2)
(3)10m/s
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143401452675.png)
(1)
V
(2)
N
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143402061638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143401452675.png)
(3)当F=F安时,速度最大
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143402170828.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434022481063.png)
本题考查法拉第电磁感应定律,由感应电动势公式E=Blv,安培力公式F=BIL和欧姆定律可求得安培力大小,再由牛顿第二定律可求得加速度大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143401546610.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143401905913.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143402061638.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143401452675.png)
(3)当F=F安时,速度最大
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143402170828.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434022481063.png)
本题考查法拉第电磁感应定律,由感应电动势公式E=Blv,安培力公式F=BIL和欧姆定律可求得安培力大小,再由牛顿第二定律可求得加速度大小
![](http://thumb2018.1010pic.com/images/loading.gif)
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