As shown in the figure, two long straight wires are separated by a distance of d=0.80 m. The currents are 1.2 A to the right in the upper wire and 8.7 A to the left in the lower wire. What are the magnitude (in μT ) of the magnetic field at point P, which is a distance d/2=0.4 m below the lower wire? (μ0​=4π×10−7Tm/A).