Jan28 - John Shumway Department of Physics and Astronomy...

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Unformatted text preview: John Shumway Department of Physics and Astronomy Arizona State University Tempe Arizona http://physics.asu.edu/shumway john.shumway@asu.edu PHY 131: University Physics II Lecture 4: Electric Field Lines and Dipoles Young and Freedman, Chapter 21.5, 21.6, 21.7 9:0010:15, Tuesday, January 19, 2010 PSF 173 Department of Physics 1 john.shumway@asu.edu Why do we care about electric felds? Electric felds create Forces that accelerate charged particles around. F = m a F = q E E ( r ) = j 1 4 q j | r- r j | 2 r- r j | r- r j | Particle dynamics are determined by Newtons second law, and electric felds create Forces are charged particles. We are learning how to calculate electric felds. Please see the applet Presenting... your Electric ield! at http://qbx6.ltu.edu/s_schneider/physlets/main/efeld.shtml For some neat demonstrations oF how particles move in electric felds. UnFortunately, fnding the electric felds and resulting trajectories oFten requires a computer. 2 john.shumway@asu.edu We can represent the electric feld with an array oF short vectors or with feld lines (streamlines oF the feld)....
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This note was uploaded on 03/10/2010 for the course MATHEMATIC 242 taught by Professor Heckman during the Spring '10 term at University of Arizona- Tucson.

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Jan28 - John Shumway Department of Physics and Astronomy...

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