题目内容
穿过一个电阻为2Ω的闭合线圈的磁通量每秒均匀减小0.4Wb,则线圈中 ( )
A.感应电动势为0.4V |
B.感应电动势每秒减小0.4V |
C.感应电流恒为0.2A |
D.感应电流每秒减小0.2A |
AC
试题分析:由题,穿过闭合线圈的磁通量每秒均匀减小0.4Wb,则得到磁通量变化率大小为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191522726836.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191523038751.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824191523334651.png)
故选AC
点评:当穿过闭合线圈的磁通量均匀变化时,线圈中产生的感应电动势和感应电流是恒定不变的.
![](http://thumb2018.1010pic.com/images/loading.gif)
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