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Is it possible to have relative permitti...

Is it possible to have relative permittivity less than one ?

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We have that relative permittivity `= in_(r) = (F_("air"))/(F_("medium"))`
Because `F_("air") gt F_("medium")`
So `(F_("air"))/(F_("medium"))` is greater than 1 and hence `in_r` , always greater than one.
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