10 - Capacitance I

10 - Capacitance I - Physics 212 - Fall 2009 Capacitance I...

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Unformatted text preview: Physics 212 - Fall 2009 Capacitance I 9/14/2009 Schedule Today - Capacitors I Tuesday - New homework available Wednesday - CAPA hour, Exam Friday - Capacitors II What is a Capacitor? Useful Device - Stores charge Can be any shape, big or small Parallel plates is a common design Material between plates can be air Most often is dielectric material Plates have equal and opposite charges q Capacitor said to have the amount of charge q Capacitor Circuit Use a battery to put the two plates at different electric potential Get positive plate and a negative plate q = CV The amount of charge stored (q) depends on C - Capacitance - units: Farads=Coulomb/Volt V - potential difference across the plates Typical circuit diagram Note shape of battery icon - Negative side is shorter + Terminal of battery and h-plate (positive plate) are at the same potential- Terminal of battery and l-plate (negative plate) are at the same potential Analyzing the Capacitor Parallel Plate Capacitor Charge plates of area A with charge q, Fnd E,V,C use Gauss Law to relate q and E E d A = q EA = q ield E and potential...
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10 - Capacitance I - Physics 212 - Fall 2009 Capacitance I...

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