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In free space, which parameter will be unity?(a) Permittivity(b) Absolute permittivity(c) Relative permittivity(d) PermeabilityThe 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

Answer»

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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