试题与答案

通电螺线管附近小磁针静止时，N极指向如图所示，则螺线管的a端是___ 极，电源的

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题型：填空题

题目：

通电螺线管附近小磁针静止时，N极指向如图所示，则螺线管的a端是___ 极，电源的d端是_______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：B解析：建筑物折旧的求取。

考点：电流的磁效应
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