For the reader printed circuit board antenna a$.$ Outer track width $39$mm$,$ outer height $42$mm b$.$ Track width $0\mathrm{.}6$mm$,$ gap $0\mathrm{.}4$mm$,$ copper thickness $1$oz$/1\mathrm{.}4$mil$/35$m c$.$ Number of turns $2($using $(1)/(2)$ the loop$)$ Calculate the inductance of this coil treated as a planar rectangular spiral inductor, be sure to include units.