Two very long wires parallel to the Z-axis (in xz plane) and a distance '4a' (along x-axis) apart carry equal currents I in opposite directions as shown in the figure.Acylinder of radius a and length L has its axis on the Z-axis midway between the wires, calculate the net upward magnetic flux through half of the curved cylindri- cal surface above the x-z plane
(a) μ0IL/π
(b) μ0ILln3/π
(c) μ0ILln2/π
(d) μ0IL/2
