試題詳解

【已刪除】(試題疑義：無答案)47. There is a straight current-carrying conductor with current I =10 A and length L = 2 m. What is the magnetic field B of this conductor at the distance 2 m from that? ( μ0 is permeability constant )
(A) 5 μ₀
(B) 5 μ₀/π
(C) 5 μ₀/2π
(D) μ₀/2π
(E) μ₀/π