根据图中磁感线方向,标出通电螺线管及小磁针的N、S极,并用“+

根据图中磁感线方向,标出通电螺线管及小磁针的N、S极,并用“+”、“一”标出电源的正负极。

答案

解析:
略根据安培定则判断。

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