Most materials {insulator}| {dielectric} allow no free electron movement. Air, vacuum, paper, and glass are insulators.
dipoles
Outside electric field separates electrons and protons, to make induced charge. Inducing charge can be easy or hard. Dielectric strength is ratio between material capacitance and vacuum capacitance. For vacuum, dielectric constant is 1. For insulators, dielectric constant is 1 to 8. For water, dielectric constant is 81, because water has high polarization and free dipole rotation. For conductors, dielectric constant is infinite. Lustrous metals have negative dielectric constant.
Physical Sciences>Physics>Electromagnetism>Conductivity>Insulator
5-Physics-Electromagnetism-Conductivity-Insulator
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Date Modified: 2022.0224