lecture11 - 1 Capacitance (Chapter 26) Capacitance (Chapter...

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Unformatted text preview: 1 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, 5, 9, 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 = 2 Example 1: Parallel Plates Example 1: Parallel Plates area A, separation d d +Q-Q Surface charge densities: A Q 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 D) two of the above E) all of the above 3 Example 2: Concentric Spheres Example 2: Concentric Spheres R 1 R 2 1 2 1 1 1 4- - = R R C Derive: (do for homework!) Examples: Examples: 1) 2 sheets of foil, 25 cm x 40 cm, 1 mm apart (in air.)1) 2 sheets of foil, 25 cm x 40 cm, 1 mm apart (in air....
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This note was uploaded on 02/17/2011 for the course PHYSICS 1E03 taught by Professor Jopko during the Spring '08 term at McMaster University.

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lecture11 - 1 Capacitance (Chapter 26) Capacitance (Chapter...

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