A balanced three$-$phase $240-$V source supplies a balanced three$-$phase

load. If the line current IA is measured to be $12$ A and is in phase with

the line$-$to$-$line voltage, VBC$,$ find the per$-$phase load impedance if the

load is $($a$)$ Y$-$connected, $($b$)$ D$-$connected