题目内容
一个10匝的闭合线圈总电阻为0.5 Ω,线圈的面积为100 cm2,垂直于线圈平面的匀强磁场的磁感应强度B随时间变化的情况如图所示.由此可知,线圈中磁通量变化率在0—0.2 s内为__________,在0—0.4 s内线圈产生的热量为__________.![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210041232699.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241210041232699.jpg)
0.1 Wb/s 0.8 J
B-t图线的斜率数值上为磁感应强度的变化率,即
.由图象可以求得
,线圈面积S不变,磁通量的变化率为
,0—0.2 s 内和0.2—0.4 s内磁感应强度变化率大小相等,均为
="10" T/s.则
="0.01×10" Wb/s="0.1" Wb/s,线圈中的感应电动势大小为E=N
="10×0.1" V="1" V,线圈中的感应电流为
,0—0.2 s内和0.2—0.4 s内线圈中电流大小相等,方向相反.0—0.4 s内线圈中产生的热量为Q=I2Rt=22×0.5×0.4 J="0.8" J.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004138307.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004138307.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004170591.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004138307.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004170591.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004201301.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824121004216622.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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