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如图所示,处在磁感应强度为B的匀强磁场中的矩形线圈abcd,以恒定的角速度ω绕ab边转动,磁场方向垂直于纸面向里,线圈所围面积为S,线圈匝数为N,导线的总电阻为R,t=0时刻线圈平面与纸面重合,在它从图示位置转过90°的过程中,下列说法正确的是( ) A.在图示位置时,线圈中电流的瞬时值最大 B.穿过线圈的最大磁通量φm=NBS C.通过导线截面的电量q=
NBSπ/(4R) D.线圈中电流的有效值I=
NBSω/(2R)
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