For Teflon, the relative permittivity is $\epsilon_r = 2.1$. The permittivity of free space is $\epsilon_0 = 8.85 \times 10^{-12} \, \text{F/m}$. So, the permittivity of Teflon is $\epsilon = \epsilon_r \epsilon_0 = 2.1 \times 8.85 \times 10^{-12} \,
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