18. Explain the potential energy of a
point charge in the presence of electric field
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Definition. ... The electrostatic potential energy, UE, of one point charge q at position r in the presence of an electric field E is defined as the negative of the work W done by the electrostatic force to bring it from the reference position rref to that position r.
Derivations from other quantities: UE = C · V2 / 2
SI unit: joule (J)
Common symbols: UE
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