如图 1 所示,小型交流发电机的单匝矩形金属线圈在匀强磁场中绕垂直磁场的轴匀速转动,线圈与一个阻值为 R =9Ω 的电阻构成闭合电路,线圈的电阻 r =1Ω 。从中性面开始计时,线圈中产生的感应电动势随时间按正弦规律变化 ( 如图 2 所示 ) ,则下列说法正确的是
A.
线圈的转速为 2. 5 r / min
B.
电压表的示数为 9
C.
通过线圈的最大磁通量为
D.
从中性面转过 90 °通过电阻 R 的电量为
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