energy when q3is at Aand UBis the potential energy when q3is at B, then the work done in moving the charge from Bto Ais W = UA– UB= q3(VA– VB) = (3.0 ×10–6C)(6.0 ×104V + 7.8 ×105V) = 2.5 J. (d) The work done by the external agent is positive, so the energy of the three-charge system increases. (e) and (f) The electrostatic force is conservative, so the work is the same no matter which path is used. 45. (a) Let A=015.m be the length of the rectangle and w= 0.050 m be its width. Charge q1is a distance Afrom point Aand charge q2is a distance w, so the electric potential at Ais 66922120415.0 10 C2.0 10 C(8.99 10 N m / C )40.15m0.050 m6.0 10 V.AqqVwε−−⎛⎞−××=+=
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.