在均匀外磁场中,有两个平行放置的平面载流线圈1和2,线圈平面的法线方向与磁场垂直.它们的面积A1=3A2,通过的电流强度I1=2I2,则线圈1和2所受到的外磁场作用的力矩大小之比M1:M2等于
A.1:1
B.2:1
C.3:1
D.6:1
正确答案是D
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