A long wire carrying a 5.0 A current perpendicular to the xyplane intersects the x- axis at x = -2.0 cm. A second. parallel wire carrying a 3.0 A current intersects the x- axis at x = +2.0 cm. At what point or points on the xaxis is the magnetic eld zero if a. The two currents are in the same direction b. The two currents are in opposite directions Draw diagrams representing the direction of current and magnetic fields for cases a and b