Electric energy density (22-14)

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Question

Permittivity of free space
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Review

Equation 22-14 says that wherever there is an electric field, there is energy. This motivates the idea that the energy stored in a capacitor is stored in the field itself. We derived Equation 22-14 for the special case of a parallel-plate capacitor, but it turns out to be valid in any situation where an electric field is present.