试题与答案

如图所示,放在通电螺线管内部中央处的小磁针,静止时N极指向右端,则电源的a端为_

题型:填空题

题目:

如图所示,放在通电螺线管内部中央处的小磁针,静止时N极指向右端,则电源的a端为______ 极,螺线管的c端为______ 极.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:错

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