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chp28_2 - A to B without changing the kinetic energy ∆ V...

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PHY2061 R. D. Field Department of Physics chp28_2.doc University of Florida Electric Potential Energy Electrostatic Force: F = K q 1 q 2 /r 2 Electric Potential Energy: EPE = U ( Units = Joules ) Kinetic Energy: KE = 1 2 2 m v ( Units = Joules ) Total Energy: E = KE + U ( Units = Joules ) Work Energy Theorem: (work done on the system) W = E B - E A = (KE B - KE A ) + (U B - U A ) Energy Conservation: E A =E B (if no external work done on system) Electric Potential Difference V = U/q: Work done ( against the electric force ) per unit charge in going from
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Unformatted text preview: A to B ( without changing the kinetic energy ). ∆ V = W AB /q = ∆ U/q = U B /q - U A /q ( Units = Volts 1V = 1 J / 1 C ) Electric Potential V = U/q: U = qV Units for the Electric Field (Volts/meter): N/C = Nm/(Cm) = J/(Cm) = V/m Energy Unit (electron-volt): One electron-volt is the amount of kinetic energy gained by an electron when it drops through one Volt potential difference 1 eV = (1.6x10-19 C)(1 V) = 1.6x10-19 Joules 1 MeV = 10 6 eV 1 GeV=1,000 MeV 1 TeV=1,000 GeV q B A...
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