# Test 1 - P HYSICS 2102 STUDY GUIDE TEST 1 Electrical Force...

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PHYSICS 2102 STUDY GUIDE TEST 1 : Electrical Force : [F e ]=N, [q]=C Coulomb’s Law = ( )( Fe k q1 ) q2 r2 : Electric Field of a Point Charge: [E]= NC = = E Feqt kqsr2 The Electric Field always points from positive to negative. Positive charges (protons) want to travel in the direction of the electric field, but negative charges (electrons) want to travel in the opposite direction. : Electric Field due to a Line of Charge: = = λ chargelength QL = dE kdqr2 where (small piece of charge on line) = dq λdl , , dl should be chosen dx dy or dsRdΘ based on the ( . . ) geometry of the line i e ds for a curve To solve for E, integrate both sides: = = dE ifkdqr2 ifkλdlr2 : Flux: [ Φ ]= Nm2C = = Φ E∙dA qencϵ0 If electric field is constant: = = Φ E∙A EAcosθ

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Gauss’ Law = = Φ E∙dA qencϵ0 , : = On a Gaussian surface the integral reduces to EA qencϵ0 : Spherical Symmetry: : = In a Gaussian Sphere E kqr2 Insulating Sphere: Linear: = = λ chargelength QL Surface: = = σ chargearea QA
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## This note was uploaded on 05/11/2011 for the course PHYSICS 2102 taught by Professor Dowling during the Spring '10 term at LSU.

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Test 1 - P HYSICS 2102 STUDY GUIDE TEST 1 Electrical Force...

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