6-23. Consider two anti-parallel current-carrying strips of width w, infinite length (in the z direction), separation d, and current I, -I.
$J_s = a_z \left(\frac{I}{w}\right) \left(x = \frac{d}{2}, -\frac{w}{2} < y < \frac{w}{2}\right)$
$ = -a_z \left(\frac{I}{w}\right) \left(x = -\frac{d}{2}, -\frac{w}{2} < y < \frac{w}{2}\right)$
(a) Find the magnetic fields everywhere.
(b) Plot the magnetic field along the x axis as a function of x.