chp28_4 - PHY2061 R. D. Field Potential Energy &...

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PHY2061 R. D. Field Department of Physics chp28_4.doc University of Florida Potential Energy & Electric Potential Mechanics (last semester!): Work done by force F in going from A to B: WF d r AB byF A B =⋅ r r Potential Energy Difference U: WU U U F d r againstF BA A B == = r r r r FU U x x U y y U z z =−∇ =− $$$ Electrostatics (this semester): Electrostatic Force: r r Fq E = Electric Potential Energy Difference
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