Electric Charge and ForceProf. Stephen Sekula1/20/2011Supplementary Material for PHY1308 (General Physics – Electricity and Magnetism)Announcements●Homework 0:●Due next Monday by 8pm●Submit using Blackboard (courses.smu.edu)–there is an assignment called “Homework 0”●First official in-class Quiz●Next Thursday●Bring pens/pencils and calculator●Based on Homework 0table of contents●Benjamin Franklin●Language to Math●Attractive Balloon●Beam Tree!●Shocking stuff●Augustin-Charles de Coulomb●Coulomb's LawBenjamin franklin17591706-1790Experimented with electricity around the 1750s.language to math“The total electric charge in any system is equal to the algebraic sum of the individual charges that make up the system.”Demonstrations●Van de Graaf generator●Candle and CapacitorStephen J. Sekula - SMU 7Attractive balloon●In-class demonstration of electric charge using a balloon●PhET simulation of the same processhttp://phet.colorado.edu/en/simulation/balloonsStephen J. Sekula - SMU 8http://www.youtube.com/watch?v=1EVQmhBoWy8Stephen J. Sekula - SMU 9Beam tree!Stephen J. Sekula - SMU 10http://www.youtube.com/watch?v=-Qq7U7tFsvQStephen J. Sekula - SMU 11Charles-Augustin de CoulombBorn/Died in France1736-1806First presented his work on electricity and magnetism in 1785(this work was ongoing just a few years after the end of the American Revolution and a few years before the start of the French Revolution)Stephen J. Sekula - SMU 12Coulomb's LawF12=k⋅q1⋅q2r2rTells you the force that charge 1 (the “source charge”) exerts on charge
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