题目内容
如图所示,长为
、宽为
的矩形线圈,电阻为
,处于磁感应强度为
的匀强磁场边缘,磁场方向垂直于纸面向外,线圈与磁感线垂直。在将线圈以向右的速度
匀速拉出磁场的过程中。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241330358261512.png)
求:(1)拉力
的大小;
(2)线圈中产生的电热
;
(3)通过线圈某一截面的电量
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035233309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035280340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035326303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035389309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035607265.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241330358261512.png)
求:(1)拉力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035950302.png)
(2)线圈中产生的电热
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133035982333.png)
(3)通过线圈某一截面的电量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036028310.png)
见解析
(1)线框匀速拉出,有
……………(2分)
…………………………(2分)
…………………………(2分)
综上解得:
………………………(1分)
(2) 对线框,由功能关系得:
……………………………(3分)
代入F解得:
…………………… (2分)
(3)
…………………… (3分)
(说明:以上各问,用其他方法求解,答案正确同样得分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036060545.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036106544.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036138583.png)
综上解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036231746.png)
(2) 对线框,由功能关系得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036325752.png)
代入F解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133036356828.png)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241330363871073.png)
(说明:以上各问,用其他方法求解,答案正确同样得分)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目