题目内容
如图所示,长L1宽L2的矩形线圈电阻为R,处于磁感应强度为B的匀强磁场边缘,线圈与磁感线垂直。求:将线圈以向右的速度v匀速拉出磁场的过程中,⑴拉力F大小;⑵拉力的功率P;⑶拉力做的功W;⑷线圈中产生的电热Q;⑸通过线圈某一截面的电荷量q。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154126461034.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154126461034.gif)
(1)
(2)
⑶![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412739543.gif)
⑷
⑸![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412895305.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412661537.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412724391.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412739543.gif)
⑷
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412880395.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412895305.gif)
⑴
⑵
⑶
⑷
⑸
与v无关
点评:这是一道基本练习题,应该思考一下所求的各物理量与速度v之间有什么关系。特别要注意电热Q和电荷q的区别,其中
与速度无关!
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412927904.gif)
⑵
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412942640.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115412958729.gif)
⑷
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115413083448.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115413239652.gif)
点评:这是一道基本练习题,应该思考一下所求的各物理量与速度v之间有什么关系。特别要注意电热Q和电荷q的区别,其中
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115413254448.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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