lecture3

# lecture3 - Physics 2102 Gabriela Gonzlez Charles-Augustin...

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1 Physics 2102 Gabriela González 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/r 2 The “dipole moment” vector p has magnitude qa and direction from –ve to +ve charge. Far from a dipole, |E|~kp/r 3 p http://phet.colorado.edu/en/simulation/electric-hockey

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2 • 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
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lecture3 - Physics 2102 Gabriela Gonzlez Charles-Augustin...

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