A Very Long Thin Wire Produces a Magnetic Field Of 0.0020

Multiple Choice

A very long thin wire produces a magnetic field of $0.0020 \times 10 ^ { - 4 } \mathrm {~T}$ at a distance of $1.0 \mathrm {~mm}$ from the wire. What is the magnitude of the current? (?₀ = 4? × 10^-7 T ? m/A)

A) 1.0 mA
B) 2.0 mA
C) 4000 mA
D) 3100 mA