An infinitely long wire carrying current I is along Y-axis such taht its one end is at point A(0,b) while the wire extends upto `+oo`. The magnitude of magnetic field strength at point (a,0) is

Options

A. `(mu_(0)l)/(4pi a)(1+(b)/sqrt(a^(2)+b^(2)))`
B. `(mu_(0)l)/(4pi a)(1-(b)/sqrt(a^(2)-b^(2)))`
C. `(mu_(0)l)/(4pi a)((b)/sqrt(a^(2)+b^(2)))`
D. None of these