Lecture 24a

# Lecture 24a - Electrostatic Potential Energy and Electric...

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Electrostatic Potential Energy and Electric Potential U V

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Electrostatic Potential Energy 2 positive charges repel I must do positive work to bring q 2 to point A a distance R away from q 1 The amount of work I do is called the electrostatic potential energy of the system +q 1 +q 2 R A http://web.mit.edu/8.02t/www/802TEAL3D/visualizations/electrost atics/VandeGraffRepel/VDGRepel.htm
A +q 1 +q 2 R I am bringing q 2 from far away to point A I have reached the point B, at distance r I must exert force F DP equal and opposite to F el B r F el F DP Every step dr of the way, I do work dW DP = F DP • dr How much work do I do?

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A +q 1 +q 2 R B r F el F DP The work I do to bring charge q2 from far away to point A is R Since the electric force is conservative, it doesn’t matter what path I take to get from ∞ to A. Electrostatic potential energy of the system is +ve if q 1 , q 2 have the same sign
©University of Colorado, Boulder (2008) CT 29.2e Q: I take a pair of tweezers and move a proton from a negative plate to a positive plate. The Electric potential energy of the system

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## This note was uploaded on 02/05/2011 for the course PHYS 220B taught by Professor Preminger during the Fall '10 term at CSU Northridge.

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Lecture 24a - Electrostatic Potential Energy and Electric...

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