$5\mathrm{.}26$ A $300-km,500-kV,60-Hz$ three$-$phase uncompensated line has a positive$-$sequence series reactance $x=0\mathrm{.}34\frac{}{k}m$ and a positive$-$sequence shunt admittance $y=j4\mathrm{.}5{10}^{-6}\frac{S}{k}m.$ Neglecting losses, calculate: $($a$)Z_c,($b$)(l),($c$)$ the ABCD parameters, $($d$)$ the wavelength $$ of the line, in kilometers, and $($e$)$ the surge impedance loading in MW$.$

$5\mathrm{.}27$ Determine the equivalent $$ circuit for the line in Problem $5\mathrm{.}26.$