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In free space, which parameter will be unity?

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in Electromagnetic Theory by (188k points)
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

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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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