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A coil of inductance 10 H, resistance 40 Ω is connected as shown in the figure. The switch S connected with point 1 for a very long time, is moved to point 2 at t=0. If, at t=0^+, the voltage across the coil is 120 V, the value of the resistance R is __________ (a) Zero (b) 20 Ω (c) 40 Ω (d) 60 Ω I got this question in exam. I'm obligated to ask this question of Calculation of I(0+), di/dt(0+), d2I/dt2(0+) in Circuits Involving both Capacitor and Inductor topic in portion 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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The correct answer is (a) Zero Explanation: IL at 0^– = \frac{120}{60} = 2A 120 = 2(R + 40 + 20) ∴ R = 0.

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