問題詳情
16. 一條電纜線埋藏在一座南北走向的牆裡，電纜線不一定為南北向。在牆的西側處，當放一指南針時，其指向剛好比原來指向旋轉 180o。由此可判斷，這條電纜線中的電流方向為
(A)可能向北
(B)可能向南
(C)可能鉛直向下
(D)可能鉛直向上。
(A)可能向北
(B)可能向南
(C)可能鉛直向下
(D)可能鉛直向上。
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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