题目内容
如图,足够长的光滑导轨倾斜放置,导轨宽度为L,,其下端与电阻R连接;导体棒ab电阻为r,导轨和导线电阻不计,匀强磁场竖直向上。若导体棒ab以一定初速度
下滑,则ab棒
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033086732946.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003308658325.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033086732946.png)
A.所受安培力方向水平向右 |
B.可能以速度![]() |
C.刚下滑瞬间产生的电动势为![]() |
D.减少的重力势能等于电阻R产生的内能 |
AB
试题分析:导体棒ab以一定初速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003308658325.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003308736529.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003308751646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003308767303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003308798275.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250033088144368.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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