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lecture8 - Electric Potential Text sections 25.1 25.2 25.4...

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1 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 (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
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2 Recall… or ds E ds F = = q dW = B A q W ds E U U U W B A B A Δ - = - = 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 Δ 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”)
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3 “Electron Volt” (eV): A unit of energy 1 eV = e × (1 volt) 1.609 × 10 -19 J
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