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Find the Thevenin’s impedance in the following circuit.(a) 11.3∠45⁰(b) 12.3∠45⁰(c) 11.3∠-45⁰(d) 12.3∠-45⁰This question was posed to me in an interview for internship.This intriguing question originated from Thevenin’s Theorem in portion Steady State AC Analysis of Network Theory

Answer»

Correct option is (c) 11.3∠-45⁰

The BEST I can explain: The IMPEDANCE is equal to the impedance seen into the NETWORK across the output TERMINALS. Zab = 4 + (2+j6)(-j4)/(2+j2) = 11.3∠-45^o Ω.



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