题目内容
如图12-3-13所示,平行金属导轨间距为d,一端跨接一阻值为R的电阻,匀强磁场磁感应强度为B,方向垂直轨道所在平面,一根长直金属棒与轨道成
角放置.当金属棒以垂直棒的恒定速度
沿金属轨道滑行时,电阻R中的电流大小为________,方向为__________.(不计轨道与棒的电阻)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241139430854153.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943038255.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943054193.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241139430854153.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943085554.gif)
导体棒在导轨间切割磁感线的有效长度为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943256714.gif)
产生的感应电动势为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943272691.gif)
所以电阻R上的电流为![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943303688.gif)
由右手定则判断出感应电流是自上而下通过电阻R.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943256714.gif)
产生的感应电动势为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943272691.gif)
所以电阻R上的电流为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113943303688.gif)
由右手定则判断出感应电流是自上而下通过电阻R.
![](http://thumb2018.1010pic.com/images/loading.gif)
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