Materials have ease by which electric fields can go through {permittivity}|. Metals have free electrons and cannot have electric fields inside. Insulators have charges that move relative to electric field and oppose electric field. Empty space has no charges and allows electric field. Electric-force constant k inversely depends on permittivity.
Physical Sciences>Physics>Electromagnetism>Conductivity>Insulator
5-Physics-Electromagnetism-Conductivity-Insulator
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Date Modified: 2022.0224