如图所示,图线a是线圈在匀强磁场中匀速转动时产生的正弦交流电

如图所示,图线a是线圈在匀强磁场中匀速转动时产生的正弦交流电的图像,当调整线圈转速后,所产生的正弦交流电的图像如图线b所示。以下关于这两个正弦交流电的说法中正确的是(    )

A.线圈先后两次转速之比为1:2

B.交流电a的电压瞬时值u=10sin0.4πt V

C.交流电b的最大值为20/3 V

D.在图中t=0时刻穿过线圈的磁通量为零

 

答案

C

解析:略

 

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