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An infinitely long wire carrying current $I$ is along $Y$ axis such that its one end is at point $A(0, b)$ while the wire extends upto $+ \infty .$ The magnitude of magnetic field strength at point $(a, 0)$
  • A$\frac{{{\mu _0}I}}{{4\pi a}}\left( {1 + \frac{b}{{\sqrt {{a^2} + {b^2}} }}} \right)$
  • B$\frac{{{\mu _0}I}}{{4\pi a}}\left( {1 - \frac{b}{{\sqrt {{a^2} + {b^2}} }}} \right)$
  • C$\frac{{{\mu _0}I}}{{4\pi a}}\left( { \frac{b}{{\sqrt {{a^2} + {b^2}} }}} \right)$
  • D
    None of these
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