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lec19 - 19-1Physics IClass 19The Electric FieldRev...

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Unformatted text preview: 19-1Physics IClass 19The Electric FieldRev. 13-Mar-04 GB19-2What 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:19-3Temperature Map(Temperature Field)19-4Coulomb’s Law ofElectrostatic Force (Review))rˆ(rqq41F221-επ=(Prof. B’s version.)The meaning of each term:F:Electrostatic force on charge 1 from charge 2.41επ: 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.rˆ:Unit vector from charge 1 to charge 2.19-5Superposition ofElectrostatic Forces (Review))rˆ(rqq41FN2ii2ii11on∑=-επ=(find and add X and Y components)resultant+1.0 C+5.0 Cresultant-3.0 C+5.0 CXY119-6The 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:-επ=-επ=∑∑==N2ii2ii1N2ii2ii11on)rˆ(rq41q)rˆ(rqq41FNote that the quantity in { } above is a vector.19-7...
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lec19 - 19-1Physics IClass 19The Electric FieldRev...

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