Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance of 5m between them. If P and Q carry currents of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half-way between the wires is

• A. \[\frac{3{{\mu }_{0}}}{2\pi }\]
• B. \[\frac{{{\mu }_{0}}}{\pi }\]
• C. \[\frac{\sqrt{3}{{\mu }_{0}}}{2\pi }\]
• D. \[\frac{{{\mu }_{0}}}{2\pi }\]