Q$1.$ In a balanced three$-$phase Y$-$ system, the source has an ABC phase sequence and VAN$=110/\_45$ V rms$.$ The line and load impedances are Z$1=$ R$1+$ jX$1=0\mathrm{.}7+$ j$1$ and Zab $=$ Rab $+$ jXab $=20+$ j$36,$ respectively.

$($a$)$ Find the magnitude of the delta current Iab, Ibc, or Ica at the load:

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$($b$)$ Find the phase angle of the delta current Iab at the load;

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$($c$)$ Find the phase angle of the delta current Ibc at the load;

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$($d$)$ Find the phase angle of the delta current Ica at the load;

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