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In free space, which parameter will be unity?

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In free space, which parameter will be unity? (a) Permittivity (b) Absolute permittivity (c) Relative permittivity (d) Permeability The question was posed to me in a national level competition. The query is from Plane Waves in Free Space topic in portion EM Wave Propagation 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

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Right answer is (c) Relative permittivity Explanation: The relative permittivity is a constant for a particular material. It is unity for free space or air. The absolute permittivity is a constant given by 8.854 x 10^-12 C/m2.

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