Electromagnetism PHY 712
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This 2 page Class Notes was uploaded by Miss Lucienne Hamill on Wednesday October 28, 2015. The Class Notes belongs to PHY 712 at Wake Forest University taught by Natalie Holzwarth in Fall. Since its upload, it has received 32 views. For similar materials see /class/230730/phy-712-wake-forest-university in Physics 2 at Wake Forest University.
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Date Created: 10/28/15
Notes for Lecture 1 1 Introduction 1 Textbook and course structure 2 Motivation 3 Chapters I and 1 and Appendix of Jackson a Units SI vs Gaussian b Laplace and Poisson Equations c Green s Theorm 2 Units SI vs Gaussian Coulomb s law has the form January 13 2000 F KC 1 712 Ampere s law has the form 1112 A F I KAT dSl X ng X 13912 712 Where the current and charge are related by 2391 dqldt for all unit systems The two constants KC and KA are related so that their ratio KCKA has the units of and it is erpem39mentally known that in both the SI and GGS Gaussian unit systems it the value KCKA 02 Where c is the speed of light The choices for these constants in the SI and Gaussian units are given below GGS Gaussian SI 1 KC 1 47r 0 1 n K14 02 47r Here 5 72 E 10 7NA2 and 1 0210 7NA2 898755 gtlt 109N 771202 47r 0 Below is a table comparing SI and Gaussian unit systems The fundamental units for each system are so labeled and are used to de ne the derived units Variable Sl Gaussian 81 Gaussian Unit Relation Unit Relation length m fundamental em fundamental 100 mass kg fundamental gm fundamental 1000 time 5 fundamental s fundamental 1 force N kg quot125 dyne gm m2s 105 current fundamental 5th ta mpere 5th tcoul omb s Charge C A s statcoulomb One advantage of the Gaussian system is that all of the eld vectors E7 D B7 H P M have the same dimensions and in vacuum B H and E D and the dielectric and permittivity constants e and p are unitless CGS Gaussian SI VD47tp VDp VB0 VB0 Vszi g lf Vsz gf 39 l7r 10D 0D VXHiTJd FW VXHiJ tW FqEgtltB FqEvgtltB uEDBH uEDBH S EgtltH SEgtltH
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