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Parallel plate capacitor: Find the energy stored

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1. Consider a parallel plate capacitor, fixed area A, and fixed separation, d. Find the energy stored, and after insertion of a slab of dielectric, which completely fills the space between the plates for each of the two cases

(a) The plates are connected to a battery which maintains constant potential difference
(b) The plates have fixed charges +Q and -Q and battery disconnected

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Check out for detailed discussion about capacitors at:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capcon.html#c1

1. Consider a parallel plate capacitor, fixed area A, and fixed separation, ...

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