Question

if a dielectric slab of dielectric constant K is introduced between the plates of a parallel plate capacitor completely , how does the energy density of the capacitor change?

Answer 1

Capacitance of a parallel plate capacitor is epsilon zero*area of cross section/distance between the two plates.
But when a dielectric slab of dielectric constant K is introduced then the capacitance becomes..
K*epsilon zero*area of cross section/distance between the two plates.