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Two parallel wires situated at a distance $2a$ are carrying equal currents $‘i’$ in opposite direction as shown in figure. The value of magnetic filed at a point $P$ situated at equal distances from both the wires will be
  • A$\frac{{{\mu _0}ia}}{{\pi r}}$
  • B$\frac{{{\mu _0}i{a^2}}}{{\pi r}}$
  • C$\frac{{{\mu _0}i{a^2}}}{{\pi {r^2}}}$
  • D$\frac{{{\mu _0}ia}}{{\pi {r^2}}}$
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