A parallel-plate capacitor of capacitance is charged to a potential by a battery and…
PHYSICS · Single correct · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance
Problem
A parallel-plate capacitor of capacitance C0 is charged to a potential V0 by a battery and then disconnected from the battery. The plate separation is now doubled, and simultaneously a dielectric slab of dielectric constant 3 completely fills the space between the plates. If Ui is the initial electrostatic energy stored and Uf is the final energy stored after the changes, which of the following is correct?
(a) Uf=23Ui
(b) Uf=Ui
(c) Uf=32Ui
(d) Uf=31Ui