题目内容
如图所示,在与匀强磁场垂直的平面内放置一个折成锐角的导线框
,
。在它上面搁置另一根与
垂直的直导线
,
紧贴
、
,并以平行于
的速度
从顶角
开始向右匀速滑动。设线框
和直导线
单位长度的电阻为
,磁感强度为
,则回路中的感应电流的方向为________(填“顺时针”或“逆时针”),感应电流的大小为________________。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002100864811.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209774587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209790740.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209805442.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209837404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209837404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209868474.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209805442.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209805442.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209930263.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209946292.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209774587.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000209837404.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000210039361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000210055310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002100864811.png)
逆时针、![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002101641117.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002101641117.png)
试题分析:据题意,导体棒上单位时间内产生的电动势为E=Bvtanα,金属框倾斜部分单位时间内增加的电阻为R1=vR0/cosα,金属框水平部分单位时间内增加的电阻为R2=vR0,直导线部分在单位时间内增加的电阻为R3=vtanαR0,所以线路中产生的电流为I="E/" (R1 +R2 +R3)=
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250002101641117.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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