Question

Consider an RL series circuit having resistance R = 3 Ω, inductance L = 3 H and is excited by 6V. The current after a long time after closing of switch is ____________ (a) 1 A (b) 2 A (c) 0 A (d) Infinity I have been asked this question by my school teacher while I was bunking the class. Question is taken from Series-Parallel Interconnection of Two Port Network topic in chapter Two-Port Networks 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

The correct choice is (b) 2 A To elaborate: At t = ∞ the circuit has effectively two 6Ω resistances in parallel. So, REQ = \frac{6 X 6}{6 + 6} = \frac{36}{12} = 3 Ω Given voltage = 6 V So, current = 2 A.