题目内容
如图,通有电流i=Imsin ωt的长直导线OO′与断开的圆形线圈在同一平面内, (设电流由O至O′为电流正向)为使A端电势高于B端电势且UAB减小,交流电必须处于每个周期的( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241958123622793.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241958123622793.png)
A.第一个![]() | B.第二个![]() |
C.第三个![]() | D.第四个![]() |
A
试题分析:由E∝
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195815950520.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195816590521.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195817120481.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824195817853312.png)
故选A
点评:关键是以A端电势高于B端电势为突破口判断
![](http://thumb2018.1010pic.com/images/loading.gif)
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A.第一个![]() | B.第二个![]() |
C.第三个![]() | D.第四个![]() |