题目内容
(10分)如图所示,ab、cd为两根相距2m的平行金属导轨,水平放置在竖直向下的匀强磁场中,当质量为3.6kg的金属棒MN中通以5A的电流时,棒沿导轨作匀速运动;当棒中电流增加到8A时,棒能获得2m/s2的加速度,求匀强磁场的磁感强度的大小。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006081113019.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006081113019.jpg)
1.2T
试题分析:当金属棒MN中通以5A的电流,棒沿导轨作匀速运动时,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000608143619.png)
当金属棒MN中通以8A的电流,棒沿导轨作匀加速运动时,由牛顿第二定律,得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000608236807.png)
代入数据得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000608252501.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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