lecture11 - Capacitance (Chapter 26) How much charge can a...

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Capacitance (Chapter 26) Capacitance (Chapter 26) How much charge can a conductor hold? •Definition •Calculating Capacitance •Dielectric Constant Serway and Jewett sections 26.1, 26.2, 26.5 Practice: Chapter 26, problems 1, 3, 7, 45 Definition : Capacitance C between two conductors, V Q C V = potential difference created when charge +Q is on one conductor, and –Q is on the other. Unit : (F) farad volt coulomb 1 =
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Example 1: Parallel Plates Example 1: Parallel Plates area A, separation d d +Q -Q Surface charge densities: A Q ± ± σ Quiz: Quiz: d +Q -Q As the plates are moved apart, which of the following will increase? A) Electric field between the plates B) Electric potential difference between the plates C) Capacitance between the plates
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Example 2: Concentric Spheres Example 2: Concentric Spheres R 1 R 2 1 2 1 1 1 4 = R R C ο πε Derive: (do for homework!) Examples: Examples: 1) 2 sheets of foil, 25 cm x 40 cm, 1 mm apart (in air.) 2) The earth (as an isolated sphere.)
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This note was uploaded on 12/03/2009 for the course CHEMISTRY 1E03 taught by Professor Britz during the Spring '09 term at McMaster University.

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lecture11 - Capacitance (Chapter 26) How much charge can a...

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