Why does the electric field inside dielectric decreases when it is places in am external field ?

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Solution

The “resultant” electric field inside dielectric decreases because dipoles (present in the form of polar covalent bonds) in the dielectric get oriented owing to the applied external electric field. And unlike ideal conductors where there are a lot of free electrons to completely nullify the effect of applied external fields (and that’s why ideal conductors are always equi-potential i.e. electric field intensity within them is zero), electrons in most dielectrics are bonded so they can only nullify the effect of external field to a limited extent.

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Q. Assertion :If a dielectric is placed in external field then field inside dielectric will be less than applied field. Reason: Electric field will induce dipole moment opposite to field direction.

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