Answer :

Initially the switch is closed and the capacitors are fully charged.


When the switch is closed, both capacitors are in parallel as shown in fig,


Hence the total energy stored by the capacitor when switch is closed is –




where C is the capacitance and V is the applied voltage.


When the switch is opened and dielectric is induced, the capacitance is




Given dielectric constant as 3



The total energy stored by the capacitor when switch is closed is –


For capacitor at AB




And EBC is –




Total energyEf)





Now, the ratio of the initial total energy stored in the capacitors to the final total energy stored –



=3/5


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