p2s10_lec03_capacitance - Physics 2 Lecture 3 2010...

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Physics 2 Lecture 3 2010 Capacitance
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What Is a Capacitor? q C V = (Coulomb) (Farad) (Volt) A device that stores charge when a potential difference is applied The ratio of charge stored to potential difference maintained is the capacitance of the object q is the magnitude of the charge on one plate + V +q -q V
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Calculating Capacitance: Parallel Plate C 1) Given a charge, find the electric field between the two capacitor plates. 2) Find the potential difference by integrating the field. , Consider a pair of plates with charge density and area A, separated by distance . d σ ± + + + + + + + - - - - - - - 0 0 0 0 / ; from Gauss' law from V=- E ds Q C Q V A E V Ed A d Qd V C A d ε = = = = = = r r
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iClicker Question 3.1 parallel plate capacitor has two square plates of side length d, separated by distance b. The capacitance is C 0 . What would the capacitance of a similar capacitor be if the side length were increased to 2d and the distance were increased to
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p2s10_lec03_capacitance - Physics 2 Lecture 3 2010...

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