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Find the maximum power delivered by the source in the following circuit.(a) 96.6(b) 97.6(c) 98.6(d) 99.6I had been asked this question in an international level competition.My doubt stems from Maximum Power Transfer Theorem in section Useful Theorems in Circuit Analysis of Network Theory

Answer»

The CORRECT answer is (C) 98.6

Easy EXPLANATION: ZT = RS – J5+ RL = 2-j5+20 = 22.56∠-12.8⁰Ω. I=VS/ZT = -50∠0⁰/22.56∠-12.8⁰ = 2.22∠-12.8⁰A. P = I^2R = (2.22)^2×20 = 98.6W.



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