题目内容
如图所示,空间某区域中有一匀强磁场,磁感应强度方向水平,且垂直于纸面向里,磁场上边界b和下边界d水平。在竖直面内有一矩形金属线框,线框上下边的距离很短,磁场上下边界之间的距离大于水平面a、b之间的距离。线框从水平面a开始下落,当线框下边刚通过水平面b、c、d时,线框所受到的磁场力的大小分别为
、
和
,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250011020004234.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001101938372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001101954343.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001101969381.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250011020004234.png)
A.![]() | B.![]() | C.![]() | D.![]() |
D
试题分析:线圈从a到b做自由落体运动,在b点开始进入磁场切割磁感线所以受到安培力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001101938372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001102141432.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001102156525.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001102110600.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目