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【单选题】
两个直流铁心线圈除了铁心截面积不同 ( S 1 =2 S 2 ) 外,其他参数都相同。若两者的磁感应强度相等,则两线圈的电流 I 1 和 I 2 的关系为( )。A.
I 1 =2 I 2
B.
I 1 = I 2 /2
C.
I 1 = I 2
D.
不确定
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