# Rec03-Electric Fields from Charge Distributions Fa20.docx -...

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PHYS 212Rec 03ELECTRIC FIELDS FROM CHARGEDISTRIBUTIONSSection #_21R_____________ Date: 09/07/2020HYSICS OBJECTIVES AND READINGSPhysics objectives:The complete list of PHYS 212 course objectives is on Canvas.This recitation focus on1.Electric Charges, Fields and Forces, specificallyc.relating electric force on a charge and the electric field experienced by thecharged.determining the electric field created by point charges or symmetricdistributions of electric chargeReadings:KnightChap 23Useful EquationsF1on2=K q1q2r2^rEon q=FonqqElectric field of a point charge:E=Kqr2^rDifferential field element for an extended object:dE=K d qr2^rWithK=14πϵ0=8.99×109N m2C2
PHYS 212RECITATIONUseful integrals(Cis a constant)sinx dx=−cosx+Ccosx dx=sinx+C2
PHYS 212RECITATIONEXERCISE 1: ELECTRIC FIELD FROM POINT CHARGESThe figure below shows four point charges located on a circle of radiusR. You needto determine the electric field at the circle’s center.In the figure, sketch four vectors thatrepresent the contributions to theelectric field at the center of thecircle due to each of each of the fourindividual point charges on the circle.Where should the vectors begin?Label1.the field vectors by chargesubscript, e.g.,E1,E2,E3,E4Also indicate the direction unitvectors:^r1,^r2,^r3,^r4. You maydraw the^rvectors starting.

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Term
Fall
Professor
Wolframm Betterman
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