Two identical parallelmplates 'A' and 'B" are connected to a battery with the switch 'S" closed The switch is - Physics - Electrostatic Potential And Capacitance

Question

Two identical parallelmplates 'A' and 'B" are connected to a
battery with the switch 'S" closed The switch is now opened and the
ree space between the plates of the capacitors is filled with
dielectric of dielectric constant 3 Find the ratio of the total
electrostatic energy stored in both capacitors before and after the
introduction of dielectric

Abhay Kumar · Accepted Answer

Total electrostatic energy = 1/2* C* V2when we introduce a dielectric of constant "3", we get :C' = 3Cwhere C' is the new capacitance therefore we know that the potential across them remains the same:therefore the ratio becomes:=1/2* C* V21/2* C'* V2= C C'=C/3C=1/3