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# lecture7 - Physics 2102 Gabriela Gonzlez Electric potential...

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Physics 2102 Gabriela González

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Electric potential energy of a system = = ± work (against electrostatic forces) needed to needed to build the system U= ± W Electric potential difference between two points = work per unit charge needed to move a charge between the two points: Δ V = V f -V i = ± W/q
Units : [U] = [W]=Joules; [V]=[W/q] = Joules/C= Nm/C= Volts [E]= N/C = Vm 1eV = work needed to move an electron through a potential difference of 1V: W=q Δ V = e x 1V = 1.60 10 -19 C x 1J/C = 1.60 10 -19 J

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Given a charged system, we can: • calculate the electric field everywhere in space • calculate the potential difference between every point and a point where V=0 • draw electric field lines • draw equipotential surfaces
In a uniform electric field E, equipotentials are PLANES. Electric field points towards lower potential. In a gravitational field, a free mass moves from high to low potential. In an electric field, which of the following is true? (a) Positive charge moves to lower V,

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lecture7 - Physics 2102 Gabriela Gonzlez Electric potential...

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