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Unformatted text preview: 191Physics IClass 19The Electric FieldRev. 13Mar04 GB192What Is a Field?A field is nothing more than a function of location, either f(X,Y)or f(X,Y,Z). There is a uniquely defined value of a certainquantity at each point. Example a temperature map:193Temperature Map(Temperature Field)194Coulombs Law ofElectrostatic Force (Review))r(rqq41F221=(Prof. Bs version.)The meaning of each term:F:Electrostatic force on charge 1 from charge 2.41: Electrostatic force constant = 8.98755 10+9N m2/C21q:Value of charge 1, positive or negative.2q:Value of charge 2, positive or negative.2r:Center distance from point charge 1 to point charge 2, squared.r:Unit vector from charge 1 to charge 2.195Superposition ofElectrostatic Forces (Review))r(rqq41FN2ii2ii11on==(find and add X and Y components)resultant+1.0 C+5.0 Cresultant3.0 C+5.0 CXY1196The Idea of Electric Field(Step 1)When finding the force on charge #1, we notice that q1appearsin each term in the sum, so we can factor it out of the sum:====N2ii2ii1N2ii2ii11on)r(rq41q)r(rqq41FNote that the quantity in { } above is a vector.197...
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This note was uploaded on 12/15/2010 for the course PHYS 0001 taught by Professor Nayak during the Spring '10 term at Rensselaer Polytechnic Institute.
 Spring '10
 NAYAK
 Physics

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