题目

正方形导线框abcd,匝数为10匝,边长为20cm,在磁感强度为0.2T的匀强磁场中围绕与B方向垂直的转轴匀速转动,转速为120r/min.当线框从平行于磁场位置开始转过90°时,线圈中磁通量的变化量是            wb,线圈中磁通量平均变化率为                                                                             wb/s,平均感应电动势为          V.                                                                                                       答案:0.008,0.064,0.64
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