题目内容
如图所示,小灯泡规格为“2 V,4 W”,接在光滑水平导轨上,导轨间距为0.1 m,电阻不计.金属棒ab垂直搁在导轨上,电阻为1 Ω,整个装置处于B=1 T的匀强磁场中.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402301523072.png)
(1)为使灯泡正常发光,ab的滑行速度为多大?
(2)拉动金属棒ab的外力的功率有多大?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402301523072.png)
(1)为使灯泡正常发光,ab的滑行速度为多大?
(2)拉动金属棒ab的外力的功率有多大?
(1)40m/s(2)8W
(1)
(1分)
(1分)
(2分)
(2分)
(2)
(3分)
本题考查法拉第电磁感应定律与电路的结合,切割磁感线的导体棒相当于电源,导体棒的电阻为电源内阻,画出等效电路图,依据闭合电路欧姆定律求解
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140230230775.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140230448777.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824140230495965.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402305421341.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241402306041218.png)
本题考查法拉第电磁感应定律与电路的结合,切割磁感线的导体棒相当于电源,导体棒的电阻为电源内阻,画出等效电路图,依据闭合电路欧姆定律求解
![](http://thumb2018.1010pic.com/images/loading.gif)
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