Electrostatic Potential and Capacitance

Question

Why does the electric field inside a dielectric decrease when it is placed in an external electric field?

Answer

The external field induces dipole moment by stretching or re-orienting the molecules of dielectric. Net effect of these induced molecular dipole moment is the production of a field that opposes the external field. So, dielectric gets polarised in opposite direction and, electric field inside dielectric decreases.

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