PHYS 0175 1st Edition Lecture 14Outline of Last Lecture II. Electric PotentialIII. EquipotentialIV. Electric field just outside conductorV. A conductor is an equipotential objectVI. Electric Potential inside a cavity in a conductorVII. Electric potential due to conducting sphereVIII.Curvature of charge density in a conductorIX. CapacitorX. Parallel Plate capacitorCurrent LectureII. CapacitorsIII. Increasing capacitanceIV. Electric Energy b/w platesV. Charging Capacitor with batteryVI. Energy Storage in CapacitorsOutline of Current Lecture XI. Capacitorsa. Pair of conductors insulated from eachotherb. Transfer qc. +- net qd. W done move qs against potential difference Ve. Depends on dist/q/geometryXII. Increasing capacitancea. Maximizing Qb. Minimizing VXIII. Electric Energy b/w platesa. U=1/2*permittivity constant*E^2*Vi. U proportional to Q^2b. Energy density ui. ½*permittivity constant*E^2XIV.Charging Capacitor with batterya. electrons flow away negative terminal of batteryb. go from lower to higher Vc. until potential difference b/w plates no longer changesd. battery is needed to create V+ and – buildup b/w 2 platese. e- flow away – sidei. same repel1. battery=Wapp=Win2. q=CVXV. Energy Storage in Capacitorsa. U=amount work done to charge itb. Need external Wapplied for like charges be on same platec. Non constantd. Increasing force to increasing U(charges would not stay there naturally)e. U=1/2QV= ½*CV^2= ½*Q^2/Cf. V-Edi. As q increases, E increases, d is
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