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Which, among the following, will be unity in free space?

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in Basic Electrical Engineering by (88.7k points)
Which, among the following, will be unity in free space?

(a) Absolute permittivity

(b) Relative permittivity

(c) Actual permittivity

(d) Both absolute and relative permittivity

I got this question in an interview.

My question is based upon Relative Permittivity in chapter Capacitance and Capacitors of Basic Electrical Engineering

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The correct answer is (b) Relative permittivity

To explain I would say: Relative permittivity is constant for a particular medium. For air or free space, it is unity. Absolute permittivity does not depend on the medium, its value is always constant=8.85*10^-12F/m. Actual permittivity is the product of relative permittivity and absolute permittivity.

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