题目内容
如图所示平行长导轨MN、PQ(电阻不计)竖直放置,间距L=1m,导轨之间接一电阻R=3
.水平导线ab,电阻r=1
,与导轨有良好接触(摩擦不计),导轨之间有指向纸里的匀强磁场B=0.5T.ab质量m=0.025kg自静止开始下落至a'b'位置时ab开始做匀速运动,aa'=h=2m,g=10m/
.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159501211502.gif)
求①ab匀速运动的速率.
②ab从静止到匀速这段时间内R上产生的热量.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115950074103.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115950074103.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082411595010697.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159501211502.gif)
求①ab匀速运动的速率.
②ab从静止到匀速这段时间内R上产生的热量.
(1)4m/s (2)0.225J
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241159501373421.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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