2054lecture6

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Unformatted text preview: The Electric Field & Gauss's Law Topics of Discussion The Electric Field Point Charges Parallel-Plate Capacitors The Electric Field Lines of Conductors Gauss's Law Applications of Gauss's Law The Electric Field The electric field E is a scalar multiple of the force (vector) F experienced by a test charge q0, and is given by F E= q0 where the unit of the electric field is N/C. The Electric Field Lines of Point Charges Electric field lines exit positive (+) point charges. + Electric field lines point enter negative (-) + point charges. - The Electric Field of a Point Charge The magnitude of the electric field E due to a point charge q experienced by a test charge q0 at a distance r is given by 1 q E= 2 4 0 r The Parallel-Plate Capacitor Let be the surface charge density of an plate of area A and charge q. Then the magnitude of the electric field E between a parallel-plate capacitor is q E= = A 0 0 Electric Field Lines of a Conductor Any excess charge resides on the surface of a conductor. At any point inside a...
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