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Dielectrics and Polarisation

Electrostatic Potential and Capacitance
Physics
Class 12

Overview

Define polarization as dipole moment per unit volume. P = X_eE. Introduce dielectrics. Define dielectric constant. K = C / C0. Relate dielectric with electric field and potential difference. E = E0 / K and V = V0 / K. Define dielectric strength. Give K = e / e0 = e_r. Discuss that in conductors, K is infinity. Realise how dielectrics are different from conductors at atomic level. Understand that in external field, both polar and non - polar dielectrics can be polarised. Define linear isotropic dielectrics. Discuss how polarised dielectric modify external field inside it. Discuss how opposite surfaces gain charges sigma and - sigma.

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Dielectrics-Polar and Non-polar Dielectric Molecules

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Basic Knowledge of Polarisation of Dielectrics

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