ideal parallel-plate capacitor

By Allen Kazadi

An ideal parallel-plate capacitor consists of a set of two parallel plates of area A separated by a very small distance d. When the capacitor plates carry charges +Q and -Q, the capacitor stores energy U0. If the separation between the plates is doubled, how much electrical energy is stored in the capacitor?

a.4U0
b.U0/4
c.U0
d.2U0
e.U0/2

Answer:

d.2U0

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