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Unformatted text preview: Physics for Scientists and Engineers, 6e Chapter 25 Electric Potential In the figure below, two points A and B are located within a region in which there is an electric field. The potential difference V = V B V A is 1 2 3 33% 33% 33% 1 2 3 4 5 1. positive 2. negative 3. zero When moving straight from A to B , E and d s in Equation 25.3 both point toward the right. Thus, the dot product E d s is positive and V is negative. In this figure, a negative charge is placed at A and then moved to B . The change in potential energy of the chargefield system for this process is 1 2 3 33% 33% 33% 1 2 3 4 5 1. positive 2. negative 3. zero From Equation 25.3, U = q V , so if a negative test charge is moved through a negative potential difference, the potential energy is positive. Work must be done to move the charge in the direction opposite to the electric force on it. The labeled points of the figure below are on a series of equipotential surfaces associated with an electric field. Rank (from greatest to least) the work done by the electric field on a positively charged particle that moves along the following transitions.transitions....
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This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.
 Spring '08
 Davies
 Electric Potential

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