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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 |
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Answer» 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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