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Two infinite length wires are placed according to figure. Magnitude of magnetic field at  point $M$ which is mid point of line joining the two wire
  • A$\sqrt 2 \, \frac{\mu_0 I}{\pi \,a}$
  • B$\frac{\mu_0 I}{2\,\pi \,a}$
  • C$\frac{\mu_0 I}{\pi \,a}$
  • D$\frac{\mu_0 I}{\sqrt 2 \,\pi \,a}$
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