Question

Find the inductance of a coil with permeability 3.5, turns 100 and length 2m. Assume the area to be thrice the length. (a) 131.94mH (b) 94.131mH (c) 131.94H (d) 94.131H This question was addressed to me in an international level competition. This key question is from Real Time Applications in section Electrostatic Fields 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

The correct choice is (a) 131.94mH The explanation is: The inductance is given by L = μ N^2A/l, where μ= μoμr is the permeability of air and the material respectively. N = 100 and Area = 3 X 2 = 6. L = 4π X 10^-7 X 100^2 X 6/2 = 131.94mH.