Question

Calculate the reluctance of a material with length 2π x 10^-4 in air with area 0.5. (a) 1 (b) 10 (c) 100 (d) 1000 The question was asked in an interview for internship. This key question is from Magnetic Energy and Circuits in division Magnetic Forces and Materials of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

Right choice is (d) 1000 The explanation: The reluctance is given by S = L/μ A, where L is the length, A is the area and μ is the permeability. On substituting L = 2π x 10^-4, A = 0.5 and μ = 4π x 10^-7, we get S = 10^3/(2×0.5) = 1000 units.