题目内容
如图甲所示,在倾角
的绝缘斜面上,固定一宽
的平行金属导轨,在导轨上端接入电源和滑动变阻器R,电源电动势
,内阻
,一质量
的金属棒ab与两导轨垂直并接触良好,整个装置处于磁感应强度B="0.80" T,垂直于斜面向上的匀强磁场中.金属导轨光滑,导轨与金属棒的电阻不计,取
,要保持金属棒在导轨上静止,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249533294712.jpg)
小题1:金属棒所受到的安培力.
小题2:通过金属棒的电流.
小题3:滑动变阻器R接入电路中的阻值.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124953236302.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124953251445.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124953267404.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124953283272.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124953298419.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824124953314516.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241249533294712.jpg)
小题1:金属棒所受到的安培力.
小题2:通过金属棒的电流.
小题3:滑动变阻器R接入电路中的阻值.
【小题1】0.1N
【小题2】0.5A
【小题2】23Ω
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412495336123469.jpg)
![](http://thumb2018.1010pic.com/images/loading.gif)
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