Derivation of the Energy Density due to an Electric Field

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What is the energy per unit volume in an electric field? We can find this by considering the work needed to pull a capacitor apart.
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An effective and straightforward approach. Nice work!

WendelSilva
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Thanks, it's easy to derive and easy to understand.

shankardigi
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oh, a much more easily understandable derivation than the other one i'd seen.

NotLegato
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How do you prove the energy density formula for any charge distribution ?

VickysTuition
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so, E = 2Ep meaning, E is the field due to both the cap. ?

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