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Unformatted text preview: 1 Electric Potential Electric Potential Text sections 25.1, 25.2, 25.4 Potential Energy and Electric Potential Field and Potential Equipotential surfaces Practice problems: Chapter 25, problems 1, 3, 5, 33, 38 Electric Potential Electric Potential (Potential energy per unit charge) A test charge q is moved from A to B in a field: + E q F r r = Find: work done by the field . ds E A B q 2 Recall or ds E ds F = = q dW = B A q W ds E U U U W B A B A - =- = The work is proportional to the charge . The electric force is conservative. Define an electrostatic potential energy, U, such that: When the field does work on the test charge, electrostatic potential energy is converted to other forms of energy. q; charge U so we introduce Electric Potential: q U V or qV U Units: 1 volt = 1 joule/coulomb (V) V is a SCALAR field V is produced by other charges Q V is a little arbitrary; we can choose to set V=0 at any position (often at infinity) 3...
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