题目内容
如图所示,直角三角形线框
固定在匀强磁场中,
是一段长为L电阻为R的均匀导线,
和
的电阻可不计,
长度为
,磁感应强度为B,方向垂直纸面向里。现有一长度为
,电阻为
的均匀导线杆
架在导线框上,开始紧靠
,然后沿
方向在外力作用下以恒定速度
向
端移动,移动过程中与导线框接触良好。当
滑过的距离为
时。求:
(1)
中产生的电流大小;
(2)外力的功率;
(3)
消耗的热功率。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204156033362.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415337241.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415369223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415369208.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415384213.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415369208.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415415258.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415415258.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415447253.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415462368.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415369208.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415369223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415509185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415525197.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415462368.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415556253.gif)
(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415462368.gif)
(2)外力的功率;
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415369223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204156033362.jpg)
(1) ![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415618526.gif)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415634583.gif)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415634561.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415618526.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415634583.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415634561.gif)
当MN滑过距离为
时刻。
(1)MN棒两端电动势![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415665488.gif)
Ram与Rmb并联
由闭合电路欧姆定律:
(2)因匀速运动,外力F=F安
而
∴外力功率
(3)ab消耗的热功率P外=P总—I2r
=P外—I2r
=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415665233.gif)
(1)MN棒两端电动势
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415665488.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415681465.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415696492.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415712293.gif)
由闭合电路欧姆定律:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415727630.gif)
(2)因匀速运动,外力F=F安
而
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241204157431015.gif)
∴外力功率
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415759648.gif)
(3)ab消耗的热功率P外=P总—I2r
=P外—I2r
=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120415634561.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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