lecture3 - Physics 2102 Introduction to Electricity,...

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Unformatted text preview: Physics 2102 Introduction to Electricity, Magnetism and Optics Physics 2102 Gabriela Gonzlez Charles-Augustin de Coulomb (1736-1806) Summary of last lecture Electric field is a vector calculated the electric force on an imaginary 1C positive charge. Electric field lines start or end in electric charges. When fields are strong, electric field lines get closer. Electric field of a single charge is |E|=kq/r2 The dipole moment vector p has magnitude qa and direction from ve to +ve charge. Far from a dipole, |E|~kp/r3 p http://phet.colorado.edu/en/simulation/electric-hockey Computing E of a continuous charge distribution Approach: divide the continuous charge distribution into infinitesimally small elements Treat each element as a POINT charge & compute its electric field Sum (integrate) over all elements Always look for symmetry to simplify life! Thus far, we have only dealt with discrete, point charges. In general, a charged object has a continuous charge distributed on a line, a surface or a volume. How do we calculate the electric field produced by such an object?...
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This note was uploaded on 11/18/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Fall '10 term at LSU.

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lecture3 - Physics 2102 Introduction to Electricity,...

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