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【单选题】
对于单匝线圈取自感系数的定义式为 。当线圈的几何形状、大小及周围磁介质分布不变,且无铁磁性物质时,若线圈中的电流强度变小,则线圈的自感系数 :A.
变大，与电流成反比关系。
B.
变小。
C.
不变
D.
变大，但与电流不成反比关系。
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