In a balanced three$-$phase system, the source is Y$-$connected, and Van $=1200$ V $($RMS

voltage$).$ The source feeds two loads. Load $1$ is Y$-$connected with an impedance of $8+$ j$6$

$/.$ Load $2$ is $-$connected with an impedance of $636/.$

a$)$ Draw the single$-$phase equivalent circuit.

b$)$ Calculate the line current $($Ia$)$

c$)$ Calculate the current Iab for load $2.$

d$)$ Calculate the line$-$to$-$line voltage at the load $($Vab$)$