Two infinitely long parallel straight wires carry currents in the +- z direction as shwn in the figure below. Each wire is located on the x-axis a distance of a from the origin.
a) Determine B as a function of y along the line x=0
b) Sketch a graph of B vs. y along the line x=0, including all values of y.
The Attempt at a Solution
for part a i get u0I/PiR
for part b as y increases, B decreases because they're inversely related?