Review - Electric Potential Energy and Electric Potentialpositive chargeHigh U (potential energy)Low Unegative chargeHigh ULow UHigh V (potential)Low VElectric field directionHigh VLow VElectric field direction
University Physics, Chapter 23September 14, 20103If a charged particle moves perpendicular to electric field lines,no work is doneIf the work done by the electric field is zero, then the electric potential must be constantThus equipotential surfaces and lines must always be perpendicular to the electric field linesReview –Equipotential Surfaces and LinesV Weq0Vis constant0 if WqE ddE
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University Physics, Chapter 23September 14, 20104Calculating the Potential from the FieldWorkdWdone on a particle with charge qby a force Fover a displacement ds:Work done by the electric force on the particle as it moves in the electric field from some initial point ito some final point fPotential difference:Potential: dWF dsqE dsfiWqE dsfefiiWVVVE dsq (Convention: i = , f = x)( )xV xE ds