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ch16_review - A Manalaysay PHY2054 Fall 2004 CHAPTER 16...

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A. Manalaysay – PHY2054, Fall 2004 CHAPTER 16 Since the electrostatic force is a conservative force, we can associate with it a potential energy. --- the potential energy between two point charges . Note that we can only define differences in potential energy, thus this equation assumes that PE=0 at r =infinity. Notice also that there are no absolute value signs around the q’s… PE is a scalar, not a vector. Remember that electric field was defined as the ratio of the force on a particle to its charge; Voltage (or Electric Potential) is defined as the ratio of the electric potential energy of a particle to its charge: in which case you can see that a point charge produces a voltage: --- The voltage produced by a point charge. And voltage is related to the electric field by: , which is similar (and you should convince yourself of this) to the work- energy theorem from physics 2053: . Can you derive one from the other? Capacitance : Any two conductors, if you place equal and opposite charges on them, will be at different voltages.
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