The permittivity \( \varepsilon \) can be expressed as:
\[
\varepsilon = \varepsilon_0 \cdot \kappa
\]
Where:
- \( \varepsilon_0 \) is the permittivity of free space (\( \approx 8.85 \times 10^{-12} \, \text{F/m} \)),
- \( \kappa \) is the dielectric constant
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