Ch15_3

# Ch15_3 - Ch. 15 Electrostatics, Part 3 PHY213, Lecture 3...

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Ch. 15 Electrostatics, Part 3 PHY213, Lecture 3 1 Conductors in Electrostatic Equilibrium s When no net motion of charge occurs within a conductor, the conductor is said to be in electrostatic equilibrium s An isolated conductor has the following properties: s The electric field is zero everywhere inside the conducting material s Any excess charge on an isolated conductor resides entirely on its surface s The electric field just outside a charged conductor is perpendicular to the conductor’s surface s On an irregularly shaped conductor, the charge accumulates at locations where the radius of curvature of the surface is smallest (that is, at sharp points) Property 1 s The electric field is zero everywhere inside the conducting material s Consider if this were not true s If there were an electric field inside the conductor, the free charge there would move and there would be a flow of charge s If there were a movement of charge, the conductor would not be in equilibrium Property 2 s Any excess charge on an isolated conductor resides entirely on its surface s A direct result of the 1/r 2 repulsion between like charges in Coulomb’s Law s If some excess of charge could be placed inside the conductor, the repulsive forces would push them as far apart as possible, causing them to migrate to the surface Property 3 s The electric field just

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## This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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Ch15_3 - Ch. 15 Electrostatics, Part 3 PHY213, Lecture 3...

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