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2.0如圖所示,長直導線垂直通過水平放置的紙板,紙板上的四個點(a、b、c、d)與導線等距離。若在這四個點上各放置一個羅盤,且導線的電流由零逐漸加大,則在何處羅盤其指針的 N 極最後幾乎會指向南方?
問題詳情
2.0如圖所示,長直導線垂直通過水平放置的紙板,紙板上的四個點(a、b、c、d)與導線等距離。若在這四個點上各放置一個羅盤,且導線的電流由零逐漸加大,則在何處羅盤其指針的 N 極最後幾乎會指向南方?
(A) a
(B) b
(C) c
(D) d。
參考答案
答案:B
難度:非常困難0
統計:A(0),B(0),C(0),D(1),E(0)
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