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The magnetic field at the origin due to the current flowing in the wire is
  • A$ - \frac{{{\mu _0}I}}{{8\pi a}}\left( {\hat i + \hat k} \right)$
  • B$\frac{{{\mu _0}I}}{{2\pi a}}\left( {\hat i + \hat k} \right)$
  • C$\frac{{{\mu _0}I}}{{8\pi a}}\left( { - \hat i + \hat k} \right)$
  • D$\frac{{{\mu _0}I}}{{4\pi a\sqrt 2 }}\left( {\hat i - \hat k} \right)$
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