Question

In the circuit given below, the input impedance ZIN of the circuit is _________ (a) 0.52 – j4.30 Ω (b) 0.52 + j15.70 Ω (c) 64.73 + j17.77 Ω (d) 0.3 – j33.66 Ω The question was posed to me in quiz. My doubt stems from Dot Convention in Magnetically Coupled Circuits topic in chapter Resonance & Magnetically Coupled Circuit of Network Theory Select the correct answer from above options network theory questions and answers, network theory questions pdf, network theory question bank, network theory gate questions and answers pdf, mcq on network theory pdf, gate network theory questions and solutions, network theory mcq Test , ies network theory questions, Network theory Questions for GATE EC Exam, Network Theory MCQ (Multiple Choice Questions)

Answer 1

Correct choice is (c) 64.73 + j17.77 Ω The best I can explain: ZIN = (-6j) || (ZA) ZA = j10 + \frac{12^2}{(j30+j6-j2+4)} = 0.49 + j5.82 ZIN = \frac{(-j6)(0.49+j5.82)}{(-j6+0.49+j5.82)} = 64.73 + j17.77 Ω.