Finding the magnetic field strength.

Hi guys, i stumbled across this question(not homework) and am stuck on this question. Could anyone help me out? Thanks guys!

Question:
There exists a current of 5A in the ay direction at x=2m, z=-2m where the ay is the unit vector in the y-direction.Find the magnetic field strength at the origin.

My attempt:
B=(uI/2*pi*r) * r
B=3.52*10*-12 Wbm^-2
B=uH
H = (3.52*10^-12)/(4pi*10^-7)
H=28*10^-7