Question

A 200 μA ammeter has an internal resistance of 200 Ω. The range is to be extended to 500μA. The shunt required is of resistance __________ (a) 20.0 Ω (b) 22.22 Ω (c) 25.0 Ω (d) 50.0 Ω This question was posed to me in class test. Enquiry is from Advanced Problems on Two Port Network topic in portion 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 choice is (c) 25.0 Ω The best explanation: Ish Rsh = Im Rm Ish = I – Im or, \frac{I}{I_m} – 1 = \frac{R_m}{R_{sh}} Now, m = \frac{I}{I_m} Or, m – 1 = \frac{R_m}{R_{sh}} ∴Rsh = 25 Ω.