Two similar coils have self-inductance of 20 mH each. Coefficient of coupling is 0.4. The mutual inductance M is ______________

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Two similar coils have self-inductance of 20 mH each. Coefficient of coupling is 0.4. The mutual inductance M is ______________

asked Oct 16, 2021 in Education by JackTerrance

Two similar coils have self-inductance of 20 mH each. Coefficient of coupling is 0.4. The mutual inductance M is ______________ (a) 2.5 mH (b) 8 mH (c) 7 mH (d) 1 mH The question was posed to me during an online interview. This intriguing question originated from Advanced Problems on Application of Laplace Transform topic in division Application of the Laplace Transform in Circuit Analysis 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)

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JackTerrance · Answer 1 · 2021-10-16T03:25:07+0000

Right answer is (b) 8 mH To elaborate: We know that, the mutual inductance M is given by, M = k\sqrt{L_1 L_2} Given that, k = 0.4, L1 = 20 mH and L2 = 20 mH So, M = 0.4\sqrt{20 X 20} = 8 mH.