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Which parameter is unity in air medium?(a) Permittivity(b) Absolute permeability(c) Relative permeability(d) PermeabilityThe question was posed to me during an internship interview.This intriguing question originated from Plane Waves in Free Space topic in division EM Wave Propagation of Electromagnetic Theory

Answer»

Right ANSWER is (c) Relative permeability

To explain: In free space or air medium, the relative permeability is also UNITY, like relative PERMITTIVITY. The absolute permeability is GIVEN by 4π x 10^-7 units.



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