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【单选题】
在条形磁铁的外面套着一个闭合弹簧线圈,若把线圈四周往外拉,使线圈包围的面积大,这时线圈中感应电流的情况是:( )A.
有感应电流；
B.
无感应电流；
C.
没有明确磁铁的N、S极，故无法判断出有无感应电流；
D.
只有线圈的电阻很小有感应电流。
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