A 100-M Long Wire Carrying a Current of 4 $\pi$ *10 ^{- 7} T

Multiple Choice

A 100-m long wire carrying a current of 4.0 A will be accompanied by a magnetic field of what strength at a distance of 0.040 m from the wire? (magnetic permeability in empty space µ₀ = 4 $\pi$ *10 ^{- 7} T.m/A)

A) zero
B) 1.6 *10^-5 T
C) 2.0 *10 ^{- 5} T
D) 4.0 *10 ^{- 5} T