题目内容
如图所示,两根间距为d的光滑金属导轨,平行放置在倾角为
的斜面上,导轨的右端接有电阻R,整个装置放在磁感应强度大小为B的匀强磁场中,磁场方向与导轨平面垂直。导轨上有一质量为m、电阻也为R的金属棒与两导轨垂直且接触良好,金属棒以一定的初速度v0在沿着导轨上滑一段距离L后返回 ,不计导轨电阻及感应电流间的相互作用。下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053168804242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005316864468.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053168804242.png)
A.导体棒沿着导轨上滑过程中通过R的电量q=![]() |
B.导体棒返回时先做匀加速运动,最后做匀速直线运动 |
C.导体棒沿着导轨上滑过程中电阻R上产生的热量Q=![]() |
D.导体棒沿着导轨上滑过程中克服安培力做的功W=![]() |
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试题分析:根据法拉第电磁感应定律得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005316942644.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005316942596.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053169741324.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005316989527.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005317005587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005317020848.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053170361417.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053170521223.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250053170671211.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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