Problem $3$ Three$-$Phase Circuits $(15$ points$)$

A three$-$phase source with VA$-$N $=12015$ feeds a three$-$phase line with impedance of $1+$j$2/$$.$ The line is

connected to a wye connected load of $39+$j$28/$$.$

a$)$ Draw the single phase circuit

b$)$ Calculate the current flowing thru the line.

c$)$ Calculate the voltage Vab across the load.