問題詳情
28. 如下圖(三)所示，用繩將兩塊軟鐵懸垂於未通電螺線管中，再使直流電I通過螺線管。若I ＞ 0代表電流由右邊R流入，左邊L流出，則兩塊軟鐵
(A)在I ＞ 0時相吸，I ＜ 0時相斥
(B)在I ＞ 0時相斥，I ＜ 0時相吸
(C)在I ＞ 0或I ＜ 0都會相吸
(D)在I ＞ 0或I ＜ 0都會相斥
(E)在I ＞ 0或I ＜ 0皆不會相吸或相斥。
(A)在I ＞ 0時相吸，I ＜ 0時相斥
(B)在I ＞ 0時相斥，I ＜ 0時相吸
(C)在I ＞ 0或I ＜ 0都會相吸
(D)在I ＞ 0或I ＜ 0都會相斥
(E)在I ＞ 0或I ＜ 0皆不會相吸或相斥。
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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