Two long, parallel wires carry currents of I = 3.20 A and 2 = 4.65 A in the direction indicated in the figure below. (Choose the line running from wire 1 to wire 2 as the positive x-axis and the line running upward from wire 1 as the positive y-axis.)
(a) Find the magnitude and direction of the magnetic field at a point midway between the wires (d = 20.0 cm).
(b) Find the magnitude and direction of the magnetic field at point ρ1, located d = 20.0 cm above the wire carrying the 4.65-A current.