問題詳情
11.鉛直豎立一根通有直流電的長直導線,一磁針在水平面上,自導線處向北方逐漸遠離導線,若磁針N極偏轉角度與北方夾角為θ時,磁針與導線相距r,則下列何者正確?
(A) 
(B) 
(C) 
(D) 
參考答案
無參考答案
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