Circuit Theorems in AC Analysis

Q1:
Referring to the given circuit, what is Z_TH if R₁ is changed to 220 ?

A 225

12.1°

B 225

77.9°

C 46

77.9°

D 46

12.1°

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.

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