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1、ExploringMagneticFieldswithaCompassBrandonLunkandRobertBeichner,NorthCarolinaStateUniversity,Raleigh,NCcompassisanexcellentclassroomtoolfortheexplo-topointinanewdirection:thatofthenetmagneticfield.Werationofmagneticfields.Anystudentcantellyoustress,ofcourse,thatth
2、ecompassmustbeparallelwiththeAthatacompassisusedtodeterminewhichdirectiongroundsothatitonlyrespondstothehorizontalcomponentsisnorth,butwhenpairedwithsomebasictrigonometry,theofnearbyfields.compasscanbeusedtoactuallymeasurethestrengthoftheAccordingtothesuperpositio
3、nprinciple,thenetmagneticmagneticfieldduetoanearbymagnetorcurrent-carryingfieldissimplythevectorsumofallcontributingfields:wire.Inthispaper,wepresentaseriesofsimpleactivitiesadaptedfromtheMatter&Interactionstextbook1fordoingBnet=BEarth+Badditional=BEarth+Bmagnet+B
4、wire+...(1)justthis.Interestingly,thesesimplemeasurementsarecompa-rabletopredictionsmadebytheBohrmodeloftheatom.Al-Ifthesituationissuchthat,ataparticularregion,thisaddi-thoughantiquated,Bohr’satomcanleadthewaytoadeepertionalmagneticfieldisperpendiculartothehorizon
5、talcom-analysisoftheatomicpropertiesofmagnets.Althoughorigi-ponentofEarth’smagneticfield(Fig.1),thentheratiooftheirnallydevelopedforanintroductorycalculus-basedcourse,respectivestrengthsfollowsthesimpletrigonometricrelation:theseactivitiescaneasilybeadaptedforusei
6、nanalgebra-basedclassorevenatthehighschoollevel.aθ.(2)WeperformedtheseactivitieswithourstudentsinaSCALE-UP(StudentCenteredActiveLearningEnvironmentTheangleqisthedeflectionangleofthecompassneedleforUndergraduatePrograms)studioatNCSU.2Themostfromthemagneticnorth.Ifb
7、oththedeflectionangleandtheprominentaspectsofthisenvironmentaretheclassroomlay-horizontalcomponentoftheEarth’smagneticfieldstrengthout,featuringroundtablestoenableface-to-faceinteractions,BEarthareknown,thenthefieldstrengthoftheadditionalandtheuseoffrequent,hands-
8、onactivities,suchastheonesfieldinthevicinityofthecompasscanbeeasilycalculated.presentedhere.TableIshowsthemagneticfieldstrengthoftheEarthinafewU.S.citie
