子婷發現電磁鐵與兩個永久磁鐵排列在一起時，磁力線的分布如圖所示。下列何者為磁極a、b、c、d的磁性？(A)N、S、N、N　(B)N、N、N、N　(C)S、S、N、N　(D)S、N、S、S。

問題詳情

30.子婷發現電磁鐵與兩個永久磁鐵排列在一起時，磁力線的分布如圖所示。下列何者為磁極a、b、c、d的磁性？
(A)N、S、N、N　
(B)N、N、N、N　
(C)S、S、N、N　
(D)S、N、S、S。

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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