PHYSICS...The two very long parallel wires shown in the figure below carry currents in the same direction...?

Two very long parallel wires carry currents in the same direction of I1=7.90 A and I2=11.85 A. The distance separating the wires is 6.13 cm and point P is midway between the two wires. 1.) What is the magnitude of the net magnetic field at point P due to the currents flowing in the two wires? 2.) The direction of... show more Two very long parallel wires carry currents in the same direction of I1=7.90 A and I2=11.85 A. The distance separating the wires is 6.13 cm and point P is midway between the two wires.
1.) What is the magnitude of the net magnetic field at point P due to the currents flowing in the two wires?
2.) The direction of the net magnetic field at point P due to the currents flowing in the two wires is...(pick one)
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If you could please explain what equation to use for number 1, that would be great. Thanks!