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 thisconductor 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