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Circuit Theorems in AC Analysis - Engineering

Q1:

Determine VTH if R1 is changed to 3.3 k.

A 0.57416.7° V

B 4.6316.7° V

C 4.6339.5° V

D 0.46339.5° V

ANS:C - 4.6339.5° V

Zeq1 = 3.3k+j2k.
Vth = (Vs * Zc) / (Zeq1 + Zc),
Vth = (12* j2k) / (3.3k + j2k + j2k) = 24kj / ( 3.3k+ j4k) = j24 / (3.3 +j4).
= 4.62 (39.52°) V.