题目内容
如图甲所示,一个电阻为R,面积为S的矩形导线框abcd,磁场的磁感应强度为B,方向与ad边垂直并与线框平面成450角,o、oˊ分别是ab和cd边的中点。现将线框右半边obcoˊ绕ooˊ 逆时针90o到图乙所示位置。在这一过程中,导线中某个横截面通过的电荷量是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017572266457.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017572115996.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017572266457.jpg)
A.![]() | B.![]() | C.![]() | D.0 |
A
试题分析:对线框的右半边(obco′)未旋转时整个回路的磁通量
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017573351114.png)
对线框的右半边(obco′)旋转90°后,穿进跟穿出的磁通量相等,整个回路的磁通量
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001757335433.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001757351958.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017573671233.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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