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  • 00:46, 25 August 2019 Kjlee (talk | contribs) created page Electrostatic energy (새 문서: ===Energy of a system of charges=== If one has two point charges <math>q_i</math> and <math>q_j</math>, the potential energy of this pair is ::<math>U_{ij} = \frac1{4\pi\epsilon_0}...)