The formula to calculate the relative permittivity (εr) is:
ϵr=CC0
Where:
Let's say the capacitance of the material (C) is 5 farads and the capacitance in a vacuum (C₀) is 1 farad. Using the formula:
ϵr=51
We get:
ϵr=5
So, the relative permittivity is 5.