$19-50$ In Fig. $19-47,$ calculate the impedance $\backslash ($ Z$\_\{$p$\}\backslash )$ across primary leads: $($a$)1$ and $3$; $($b$)1$ and $2.($Note: Terminal $2$ is a center$-$tap connection on the transformer primary. Also, the turns ratio of $4$:$1$ is specified using leads $1$ and $3$ of the primary.$)$

Figure $19-47$ Circuit for Critical Thinking Prob. $19-50.$