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Circuit Theorems in AC Analysis - Engineering

Q1:

Referring to the given circuit, what is ZTH if R1 is changed to 220 ?

A 22512.1° 

B 22577.9° 

C 4677.9° 

D 4612.1° 

ANS:C - 4677.9° 

Here to find Zth vs short-circuit and RL open circuit. R1 parallel with Xl.

Zth= 220*47i/220+47i.
=45.96∠77.94.