一只矩形線圈在勻強磁場中繞垂直于磁場的軸勻速轉(zhuǎn)動,產(chǎn)生的交流電動勢e=10sin4πt(V),下列敘述正確的是(    )                                                                                                                                 

    A.  交變電流的頻率是4πHz

    B.  當(dāng)t=0時線圈平面跟中性面垂直

    C.  當(dāng)t=s時e有最大值

    D.  交變電流的周期是0.5s

                                                                                                                                    

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