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The unit vectors $\hat i,\;\hat j\;{\rm{and }}\,\hat k$ are as shown below. What will be the magnetic field at $O$ in the following figure
  • A$\frac{{{\mu _0}}}{{4\pi }}\frac{i}{a}\left( {2 - \frac{\pi }{2}} \right)\,\hat j$
  • B$\frac{{{\mu _0}}}{{4\pi }}\frac{i}{a}\left( {2 + \frac{\pi }{2}} \right)\,\hat j$
  • C$\frac{{{\mu _0}}}{{4\pi }}\frac{i}{a}\left( {2 + \frac{\pi }{2}} \right)\,\hat i$
  • D$\frac{{{\mu _0}}}{{4\pi }}\frac{i}{a}\left( {2 + \frac{\pi }{2}} \right)\,\hat k$
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