题目内容
如图4-4所示,金属杆
在离地
高处从静止开始沿弧形轨道下滑,导轨平行的水平部分有竖直向上的匀强磁场B,水平部分导轨上原来放有一根金属杆b,已知杆
的质量为
,b杆的质量为
水平导轨足够长,不计摩擦,求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241137374422958.jpg)
小题1:(1)
和b的最终速度分别是多大?
小题2:(2)整个过程中回路释放的电能是多少?
小题3:(3)若已知
、b杆的电阻之比
,其余电阻不计,
整个过程中,
、b上产生的热量分别是多少?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737380200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737411204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737427377.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241137374422958.jpg)
小题1:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
小题2:(2)整个过程中回路释放的电能是多少?
小题3:(3)若已知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737489474.gif)
整个过程中,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
小题1:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737520538.gif)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737536933.gif)
小题3:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737551718.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737583716.gif)
小题1:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737380200.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737629584.gif)
①
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737723185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737754615.gif)
②由①②解得最终速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737520538.gif)
小题2:(2)由能量守恒知,回路中产生的电能等于
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737536933.gif)
小题3:(3)回路中产生的热量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737817482.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737832229.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737848229.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737349192.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737879512.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737551718.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113737583716.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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