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Serway_PSE_quick_ch25

Serway_PSE_quick_ch25 - Physics for Scientists and...

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Physics for Scientists and Engineers, 6e Chapter 25 – Electric Potential
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In the figure below, two points A and B are located within a region in which there is an electric field. The potential difference Δ V = V B V A is 1 2 3 33% 33% 33% 1 2 3 4 5 1. positive 2. negative 3. zero
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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 Δ V is negative.
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In this figure, a negative charge is placed at A and then moved to B . The change in potential energy of the charge–field system for this process is 1 2 3 33% 33% 33% 1 2 3 4 5 1. positive 2. negative 3. zero
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From Equation 25.3, Δ U = q 0 Δ 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.
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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.
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