试题与答案

如图15-1-10所示,放在通电螺线管内部中间处的小磁针,静止时N极指向右.试判

题型:问答题

题目:

如图15-1-10所示,放在通电螺线管内部中间处的小磁针,静止时N极指向右.试判定电源的正负极.

图15-1-10

答案:

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