02/16/2015PHY 712 Spring 2015 -- Lecture 141 PHY 712 Electrodynamics 9-9:50 AM MWF Olin 103 Plan for Lecture 14: Start reading Chapter 6 1.Maxwell’s full.

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02/16/2015PHY 712 Spring Lecture 141 PHY 712 Electrodynamics 9-9:50 AM MWF Olin 103 Plan for Lecture 14: Start reading Chapter 6 1.Maxwell’s full equations; effects of time varying fields and sources 2.Gauge choices and transformations 3.Green’s function for vector and scalar potentials

02/16/2015PHY 712 Spring Lecture 142

02/16/2015PHY 712 Spring Lecture 143 Full electrodynamics with time varying fields and sources Image of statue of James Clerk-Maxwell in Edinburgh "From a long view of the history of mankind - seen from, say, ten thousand years from now - there can be little doubt that the most significant event of the 19th century will be judged as Maxwell's discovery of the laws of electrodynamics" Richard P Feynman

02/16/2015PHY 712 Spring Lecture 144

02/16/2015PHY 712 Spring Lecture 145

02/16/2015PHY 712 Spring Lecture 146 Formulation of Maxwell’s equations in terms of vector and scalar potentials

02/16/2015PHY 712 Spring Lecture 147 Formulation of Maxwell’s equations in terms of vector and scalar potentials -- continued

02/16/2015PHY 712 Spring Lecture 148 Formulation of Maxwell’s equations in terms of vector and scalar potentials -- continued

02/16/2015PHY 712 Spring Lecture 149 Formulation of Maxwell’s equations in terms of vector and scalar potentials -- continued

02/16/2015PHY 712 Spring Lecture 1410 Formulation of Maxwell’s equations in terms of vector and scalar potentials -- continued

02/16/2015PHY 712 Spring Lecture 1411 Formulation of Maxwell’s equations in terms of vector and scalar potentials -- continued

02/16/2015PHY 712 Spring Lecture 1412 Solution of Maxwell’s equations in the Lorentz gauge

02/16/2015PHY 712 Spring Lecture 1413 Solution of Maxwell’s equations in the Lorentz gauge -- continued

02/16/2015PHY 712 Spring Lecture 1414 Solution of Maxwell’s equations in the Lorentz gauge -- continued

02/16/2015PHY 712 Spring Lecture 1415 Solution of Maxwell’s equations in the Lorentz gauge -- continued

02/16/2015PHY 712 Spring Lecture 1416 Solution of Maxwell’s equations in the Lorentz gauge -- continued

02/16/2015PHY 712 Spring Lecture 1417 Solution of Maxwell’s equations in the Lorentz gauge -- continued

02/16/2015PHY 712 Spring Lecture 1418 Solution of Maxwell’s equations in the Lorentz gauge -- continued

02/16/2015PHY 712 Spring Lecture 1419 Solution of Maxwell’s equations in the Lorentz gauge -- continued Liènard-Wiechert potentials and fields -- Determination of the scalar and vector potentials for a moving point particle (also see Landau and Lifshitz The Classical Theory of Fields, Chapter 8.) Consider the fields produced by the following source: a point charge q moving on a trajectory R q (t). q R q (t)

02/16/2015PHY 712 Spring Lecture 1420 Solution of Maxwell’s equations in the Lorentz gauge -- continued We performing the integrations over first d 3 r’ and then dt’ making use of the fact that for any function of t’, where the ``retarded time'' is defined to be

02/16/2015PHY 712 Spring Lecture 1421 Solution of Maxwell’s equations in the Lorentz gauge -- continued Resulting scalar and vector potentials: Notation:

02/16/2015PHY 712 Spring Lecture 1422 Comment on Lienard-Wiechert potential results

02/16/2015PHY 712 Spring Lecture 1423 Comment on Lienard-Wiechert potential results -- continued

02/16/2015PHY 712 Spring Lecture 1424 Summary of results for fields due to moving charge – Liénard Wiechert potentials Resulting scalar and vector potentials: Notation: