In the above question, the magnetic induction at O due to the whole length of the conductor is [MP PMT/PET 1998; RPET 2002]

• A.            \[\frac{{{\mu }_{0}}i}{r}\]       
• B.            \[\frac{{{\mu }_{0}}i}{2r}\]
• C.            \[\frac{{{\mu }_{0}}i}{4r}\]    
• D.            Zero