CLASS EXERCISE #6 - June 21, 2005(1) When two charges are separated by 4.0 m, their electric potential energyis 12 J. What can you tell, if anything, about the signs of these twocharges?Since the electric potential energy is positive, the two charges must have the samesign: they are both positive or both negative. If one were positive and the othernegative, the electric potential energy would be negative.(2) What is their electric potential energy when they are moved to aseparation of 3.0 m?The electric potential energy is proportional to 1. since 3.0 m is 0.75 timesÎ<< œas large as 4.0 m, the electric potential energy at 3.0 m must be<œ1/0.754/3 as large as it is at 4.0 m. That means the electric potential energy
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This note was uploaded on 02/11/2012 for the course PHYSICS 112 taught by Professor Fretwell during the Summer '08 term at Iowa State.