题目内容：
如图，匀强磁场垂直于纸面向里，磁感应强度大小为B；一载有电流为I，边长为ι的刚性正方形导体线圈abcd位于纸面内，则通过线圈abcd的磁通量为________，导线ab所受安培力的大小为________。
答案解析：
选择题：如图，匀强磁场垂直于纸面向里，磁感应强度大小为B；一载有电流为I，边长为ι的刚性正方形导体线圈abcd位于纸面内，则通过线圈abcd的磁通量为________，
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