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In the figure, what is the magnetic field at the point $O$
  • A$\frac{{{\mu _0}I}}{{4\pi r}}$
  • B$\frac{{{\mu _0}I}}{{4\pi r}} + \frac{{{\mu _0}I}}{{2\pi r}}$
  • C$\frac{{{\mu _0}I}}{{4r}} + \frac{{{\mu _0}I}}{{4\pi r}}$
  • D$\frac{{{\mu _0}I}}{{4r}} - \frac{{{\mu _0}I}}{{4\pi r}}$
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