题目内容
如图所示,两根相距为L的平行直导轨水平放置,R为固定电阻,导轨电阻不计。电阻阻值也为R的金属杆MN垂直于导轨放置,杆与导轨之间有摩擦,整个装置处在竖直向下的匀强磁场中,磁感应强度大小为B。t=0时刻对金属杆施加一水平外力F作用,使金属杆从静止开始做匀加速直线运动。下列关于外力F、通过R的电流I、摩擦生热Q(图C为抛物线)、外力F的功率P随时间t变化的图像中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032275213095.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032275365335.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032275213095.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032275365335.jpg)
BC
试题分析:导体棒从静止开始做匀加速直线运动,速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003227552420.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003227583657.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003227599883.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032276141041.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003227630717.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032276451320.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003227692861.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250032277081326.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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