Question

introduction of dielectric slab between the plates of a capacitor increases explain​

Answer 1

The capacitance of a set of charged parallel plates is increased by the insertion of a dielectric material. The capacitance is inversely proportional to the electric field between the plates, and the presence of the dielectric reduces the effective electric field

Answer 2

It is because after inserting slab..

New capacitance C' = K (C)

It becomes K (dielectric constant) times of it's previous capacitance...