Question

A 10 μF capacitor is charged from a 5 volt source through a resistance of 10 kΩ. The charging current offer 35 m sec. If the initial voltage on C is – 3 V is ___________ (a) 0.56 mA (b) 5.6 mA (c) 6 mA (d) 5 μA This question was posed to me in an interview for internship. Enquiry is from Relation between Hybrid Parameters with Short Circuit Admittance and Open Circuit Impedance Parameters topic in section 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

Right answer is (a) 0.56 mA Easy explanation: Initial current immediately after charging is given by, \frac{V}{R} = \frac{5+3}{10000} = 0.8 mA Now, i = i0e^-t/RC = 0.8 mA x e^{\frac{t}{10k X 10 X 10^{-6}}} = 0.8 X 10^-3 X e^{\frac{35 X 10^{-3}}{10^{-1}}} = 0.56 mA.