Answer :


Before inserting slab-


We know, capacitance c is given by-



Where,


A= Plate Area


d= separation between the plates,


0 = Permittivity of free space = 8.854 × 10-12 m-3 kg-1 s4 A2


Energy stored by the capacitor




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


After inserting slab capacitance c is given by-



Where,


A= Plate Area


d= separation between the plates,


0 = Permittivity of free space = 8.854 × 10-12 m-3 kg-1 s4 A2


k = dielectric strengthof the material


Also, the final voltage becomes


Energy stored by the capacitor–



where ,


C is the capacitance and V is the applied voltage, k is the dielectric constant of the material


The work done on the system in the process of inserting the slab


= change in energy





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