题目内容
如图所示,线圈abcd的面积是0.05m2,共100匝,线圈电阻1Ω,外接电阻R=9Ω,匀强磁场的磁感应强度为B=
T.线圈在外力作用下以300r/s的转速匀速转动.求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154525203138.jpg)
(1)若从线圈处于中性面开始计时,写出线圈中感应电动势的瞬时值表达式.
(2)电路中电流表的示数是多少?
(3)线圈从图示状态转过90°通过线圈横截面的电荷量.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452504235.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154525203138.jpg)
(1)若从线圈处于中性面开始计时,写出线圈中感应电动势的瞬时值表达式.
(2)电路中电流表的示数是多少?
(3)线圈从图示状态转过90°通过线圈横截面的电荷量.
(1)ε=3000sin(600πt)V (2)
(3)
C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452535428.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452551365.gif)
(1)ω=2πn
ε=NBωSsin(ωt)
所以ε=3000sin(600πt)V
(2)I=
,所以I=
(3)q=
,所以q=
C
ε=NBωSsin(ωt)
所以ε=3000sin(600πt)V
(2)I=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452566653.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452535428.gif)
(3)q=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452598497.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115452551365.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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