A long straight wire carries a current of \[\pi \,amp.\] The magnetic field due to it will be \[5\times {{10}^{-5}}\text{ }weber/{{m}^{\text{2}}}\] at what distance from the wire \[[{{\mu }_{o}}=\]permeability of air] [MP PMT 2002]

• A.            \[{{10}^{4}}{{\mu }_{o}}\] metre    
• B.            \[\frac{{{10}^{4}}}{{{\mu }_{o}}}\] metre
• C.            \[{{10}^{6}}{{\mu }_{o}}\] metre    
• D.            \[\frac{{{10}^{6}}}{{{\mu }_{o}}}\]metre