What is permittivity?

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Solution

Permittivity, usually denoted by the Greek letter $ϵ$ (epsilon), is the measure of resistance that is encountered when forming an electric field in a particular medium. The SI unit for permittivity is farad per meter (F/m).
$ϵ = ϵ_{r} ϵ_{o}$
Here, $ϵ$ = Permittivity of the medium
$ϵ_{r}$ = Relative permittivity of the medium
$ϵ_{o}$ = Permittivity of free space

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