Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m between them. If P and Q carry current 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 [Kerala PMT 2005]

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