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1、APPhysicsC:ElectricityMagism2001ScingGuidelinesThesematerialswereproducedbyEducationalTestingService(ETS)whichdevelopsadministerstheexaminationsoftheAdvancedPlacementProgramftheCollegeBoard.TheCollegeBoardEducationalTest

2、ingService(ETS)arededicatedtotheprincipleofequalopptunitytheirprogramsservicesemploymentpoliciesareguidedbythatprinciple.TheCollegeBoardisanationalnonprofitmembershipassociationdedicatedtopreparinginspiringconnectingstud

3、entstocollegeopptunity.Foundedin1900theassociationiscomposedofmethan3900schoolscollegesuniversitiesothereducationalganizations.EachyeartheCollegeBoardservesoverthreemillionstudentstheirparents22000highschools3500colleges

4、throughmajprogramsservicesincollegeadmissionguidanceassessmentfinancialaidenrollmentteachinglearning.AmongitsbestknownprogramsaretheSATthePSATNMSQT?theAdvancedPlacementProgram(AP)Pacesetter.TheCollegeBoardiscommittedtoth

5、eprinciplesofequityexcellencethatcommitmentisembodiedinallofitsprogramsservicesactivitiesconcerns.Copyright?2001byCollegeEntranceExaminationBoard.Allrightsreserved.CollegeBoardAdvancedPlacementProgramAPtheacnlogoareregis

6、teredtrademarksoftheCollegeEntranceExaminationBoard.ThematerialsincludedinthesefilesareintendedfnoncommercialusebyAPteachersfcourseexampreparationpermissionfanyotherusemustbesoughtfromtheAdvancedPlacementProgram.Teachers

7、mayreproducetheminwholeinpartinlimitedquantitiesffacetofaceteachingpurposesbutmaynotmassdistributethematerialselectronicallyotherwise.Thesematerialsanycopiesmadeofthemmaynotberesoldthecopyrightnoticesmustberetainedasthey

8、appearhere.Thispermissiondoesnotapplytoanythirdpartycopyrightscontainedherein.APPHYSICSC:ELECTRICITYMAGISM2001SCINGGUIDELINESCopyright?2001byCollegeEntranceExaminationBoard.Allrightsreserved.AdvancedPlacementProgramAPare

9、registeredtrademarksoftheCollegeEntranceExaminationBoard.3Question115pointstotal1.(a)4pointsDistributionofPointsFacrectfmulafdeterminingtheelectricfield1point22??==?kQkQrrErErSummingthecontributionstothefieldfromthefourg

10、eslettingfieldsdirectedupwardbepositivefieldsdirecteddownwardbenegative(fullcreditalsogivenfusingoppositeconventionaslongasanswerswereconsistent):()()()()()()()()()()()()99992222333391030910309103091030310210210310=??EFc

11、rectsubstitutionsshownintheaboveequation1point30000NC67500NC67500NC30000NC=??E75000NC=EdirectedupwardFcrectmagnitude(()6608108104π??=Ek?alsoaccepted)1pointFcrectdirectioneitherstatedshownbyanupwarddirectedarrow1pointNote

12、s:Ifwrongsignswereusedinthesubstitutionthepointfcrectmagnitudewasnotawarded.Ifcalculationwasdoneusingonlythetworealgesamaximumof3pointswasawardedasfollows:1pointfthefmula1pointfthecalculation1pointfdirection.1.(b)i.1poin

13、tFcrectlyindicatingdirectionsuchasbyanupwarddirectedarrowatpoint2P1point1.(b)ii.2pointsFcrectlycheckingthespaceinfrontof“Less”1pointFcrectjustificationsuchas“2Pisfartherfromallthegesthan1Psothefieldisless.”Ifstudentchose

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