Two Long Straight Wires Are Separated By The Wires Carry Currents Of 8a In Oppos (1)

Two long straight wires are separated by .120m. The wires carry currents of 8A in opposite directions as the drawing indicates. Find the magnitude of the net magnetic field at the points labeled A and B.PICTURE –> http://i55.tinypic.com/70j30p.jpg