Electric field inside a dielectric

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

(Thushara asked)

Answer:

The net electric field inside a dielectric decreases due to polarization. The external electric field polarizes the dielectric and an electric field is produced due to this polarization. This internal electric field will be opposite to the external electric field and therefore the net electric field inside the dielectric will be less

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