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Unformatted text preview: 1/25/12 1 Lectures 6 & 7: Chapter 23 1/25/12 1 Electric Potential q A C B r A B r Path independence Equipotential surfaces R R R r V Q 4 QF r Q 4 QF R 1/25/12 2 From Mechanics (PHYS 152/172) Energy Conservative Forces: Kinetic Energy: associated with the state of motion Potential Energy: associated with the configuration of the system Work done by a conservative force is independent of path 1/25/12 3 From Mechanics (PHYS 152/172) Work 1/25/12 4 Electric Potential Energy When an electrostatic force acts between two or more charges within a system, we can assign an Electric Potential Energy : F x Coulomb force does negative work Potential energy increases + + + + 1/25/12 2 1/25/12 5 Example: Electric Potential Energy What is the change in electrical potential energy of a released electron in the atmosphere when the electrostatic force from the near Earths electric field (directed downward) causes the electron to move vertically upwards through a distance d?...
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