Compute all part of given question:
Question: A long wire carrying a 4.5A current perpendicular to the xy-plane intersects the x-axis at x= -2.0cm. A second, parallel wire carrying a 3.5A current intersects the x-axis at x=+2.0cm.
Part I: At what point on the x-axis is the magnetic field zero if the two currents are in the same direction?
Part II: At what point on the x-axis is the magnetic field zero if the two currents are in opposite directions?
Please explain clearly with details so that I can follow. Thank you.