Question

Find the maximum power delivered by the source in the following circuit.

(a) 96.6

(b) 97.6

(c) 98.6

(d) 99.6

I 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 1

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.