Question

Determine the thevenin’s voltage in the circuit shown below.

(a) 18∠146.31⁰

(b) 18∠-146.31⁰

(c) 19∠146.31⁰

(d) 19∠-146.31⁰

I got this question in an online interview.

This question is from Thevenin’s Theorem in division Steady State AC Analysis of Network Theory

Answer 1

The correct option is (a) 18∠146.31⁰

The best I can explain: The voltage across (-j4) Ω resistor is = (5∠90^o)/((2+j2)) (-j4) = 7.07∠-45^o V. The voltage across ‘ab’ = -10∠0^o+5∠90^o-7.07∠-45^o=18∠146.31^o V.