题目内容
一个矩形线圈在匀强磁场中转动产生的交流电
V,那么:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162432993871.png)
A.频率是50赫兹 | B.当t = 0时,线圈平面恰好与中性面重合 |
C.当t=1/200秒时,e有最大值 | D.有效值为![]() |
ABC
试题分析:由交流电的瞬时值表达式知,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162433367722.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162433648565.png)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162433929368.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162434444449.png)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162434693567.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824162434958654.png)
有效值
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241624352391111.png)
点评:对于交流电的产生和描述要正确理解,要会推导交流电的表达式,明确交流电表达式中各个物理量的含义.
![](http://thumb2018.1010pic.com/images/loading.gif)
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