Electromagnetic Field Energies in Capacitors and Inductors
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A capacitor with square plates of width separated by a distance with a filler of dielectric constant (relative permittivity) has a capacitance given by . Typical values are in the range of picofarads (pF). A voltage can hold positive and negative charges on the plates of the capacitor while producing an internal electric field . Assuming idealized geometry, the energy of a charged capacitor equals . This energy can be considered to be stored in the electric field, which implies a corresponding energy density (with ).
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Contributed by: S. M. Blinder (May 2010)
Open content licensed under CC BY-NC-SA
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