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Three infinite wires are arranged in space in three dimensions.(along $x, y$ and $z$ axis) as shown. Each wire carries current $i$ . Find magnetic field at $A$ 
  • A$ - \frac{{{\mu _0}i}}{{2\pi r}}\hat i - \frac{{{\mu _0}i}}{{2\pi r}}\hat j - \frac{{{\mu _0}i}}{{\pi r}}\hat k$
  • B$ - \frac{{{\mu _0}i}}{{4\pi r}}\hat i + \frac{{{\mu _0}i}}{{4\pi r}}\hat j - \frac{{{\mu _0}i}}{{\pi r}}\hat k$
  • C$ \frac{{{\mu _0}i}}{{4\pi r}}\hat i + \frac{{{\mu _0}i}}{{4\pi r}}\hat j - \frac{{{\mu _0}i}}{{\pi r}}\hat k$
  • D$ \frac{{{\mu _0}i}}{{2\pi r}}\hat i + \frac{{{\mu _0}i}}{{2\pi r}}\hat j - \frac{{{\mu _0}i}}{{\pi r}}\hat k$
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