Nuances of Magnetism
Georgia Institute of Technology: Step­Up 2012
William Daly, Physics Teacher
Collins Hill High School, Gwinnett County, Georgia
Problem!
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Abstract!
>4(!?@;0%'!A#$72)4!B23.20#&%6!'(;2#()!1&$#(.2)1!&)!&#!&'C(3.25(D!“capable of being attracted by or acquiring the properties of a magnet”. >42)!7())0#!)((E)!.0!:%052'(!&!<%0&'(%!52(=!0;!1&$#(.2)1!=2.4!.4(!(#'!$0&7!0;!%(7&.2#$!
:(%4&:)!/#;&1272&%!.0:23)!0;!'2&1&$#(.2)1-!:&%&1&$#(.2)1-!;(%%21&$#(.2)1!&#'!;(%%01&$#(.2)1!.0!.4(2%!)4&%('!
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<6!7())0#)!0#!F1:(%(%)!G&=-!Faraday%s Law of Induction, Lenz%s!G&=-!&#'!.4(!/)(!0;!.4(!%2$4.!4&#'!%/7()!.0!
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;(%%01&$#(.23!1&.(%2&7)8!!>42)!2)!;0770=('!<6!&#!&))2$#1(#.!;0%!)./'(#.)!.0!%(;7(3.!0#!.4(!/)(!0;!.4(!%2$4.!4&#'!
%/7(!.0!'(.(%12#(!'2%(3.20#!0;!1&$#(.23!;2(7')!%()/7.2#$!;%01!34&%$()!2#!10.20#8!!I2#&776-!)./'(#.)!2'(#.2;6!
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“hands+on” activities8!!
Alignment with the National and State Standards
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W.4!J%&'(!–!!
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ObJectives
>42)!7())0#!provides varied “hand+on” experiences for students to explore abstract topics in magnetism, learning
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;(%%21&$#(.2)18!!M./'(#.)!=277!30#.%&).!.4()(!'()3%2:.20#)!=2.4!=4&.!.4(6!:%0<&<76!(#30/#.(%('!.4%0/$40/.!
.4(2%!&3&'(123!3&%((%!.0!'&.(-!.4(!.0:23!0;!;(%%01&$#(.2)18!
Anticipated Learner Outcomes!
*N Better answer the question, “What is magnetic”?!!
QN X#'(%).&#'!.4&.!52%./&776!&77!1&.(%2&7)!(@42<2.!1&$#(.23!:%0:(%.2()D!
&8 Y4234!:%0:(%.2()!033/%!0#76!2#!.4(!:%()(#3(!0;!&#!(@.(%#&7!1&$#(.23!;2(7'Z!
<8 Y4234!:%0:(%.2()!:(%)2).!2#!.4(!&<)(#3(!0;!&#!(@.(%#&7!1&$#(.23!;2(7'Z!
38 What is the meaning of the word “moment”?!
TN >4(!%00.!3&/)(!0;!&77!1&$#(.23!<(4&520%!2)!.4(!10.20#!0;!34&%$('!:&%.237()!;%01!&!37&))23&7!:(%):(3.25(!
K2#.(%&3.20#)!0;!):2#!).&.()!;%01!&![/&#./1!1(34&#23&7!:(%):(3.25(N8!
\N B2&1&$#(.2)1!2)!3&/)('!<6!'2)./%<&#3(!.0!0%<2.&7)-!:&%&1&$#(.23!2)!3&/)('!/#:&2%('!):2#!).&.()-!
;(%%01&$#(.2)1!–!experience “hands+on” classical corollaries to subatomic effects.!
WN B(5(70:!&#!&::%(32&.20#-!&#'!40:(;/776!3/%20)2.6!&#'!2#.%2$/(-!0;!.4(!'(:.4!&#'!21:0%.&#3(!0;!.4(!
1&$#(.23!:%0:(%.2()!0;!1&.(%2&7)8!
Assessment / Rubrics
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M((!&::(#'2@!U!;0%!:0))2<7(![/().20#)!0;!2#[/2%68!!"'(&776!)./'(#.)!=277!4&5(!'0#(!)01(!/:!;%0#.!%()(&%34!0#!.4(!
)0/%3(!0;!'2;;(%(#.!.6:()!0;!1&$#(.2)1!:%20%!.0!&::%0&342#$!.4(!7&<!K)((!:%(+7&<![/().20#)!2#!&::(#'2@!UN8!!
M./'(#.)!)40/7'!301(!&=&6!;%01!.4(!7&<!=2.4!.=0!1&2#!2'(&)D!
*N !>4(!)0/%3(!0;!&77!1&$#(.2)1!2)!34&%$()!2#!10.20#!K=4(.4(%!.4(6!&%(!):2#!12)1&.34()!&.!.4(!
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:%(3())20#!&.!.4(!&.0123!7(5(7N!
Background
]0'(%#!325272H&.20#!2#!1&#6!:%0;0/#'!=&6)!'(:(#')!0#!.4(!/#'(%).&#'2#$!0;!&#'!<(2#$!&<7(!.0!(#$2#((%!.4(!
1&$#(.23!:%0:(%.2()!0;!1&.(%2&7)8!!>0!#&1(!&!5(%6!)1&77!72).!0;!21:0%.&#.!(@&1:7()-!&77!:0=(%!)6).(1)-!.(7(52)20#!
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&#'!301:0/#')8!!U/.!&!1/34!<%0&'(%!&%%&6!0;!.(34#070$6!'(:(#')!0#!.4(!/#'(%).&#'2#$!&#'!(#$2#((%2#$!0;!
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Materials and Supplies
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M&;(.6!
o J0$$7()!
o O&/.20#!)./'(#.)!&<0/.!).%(#$.4!0;!%&%(!(&%.4!1&$#(.)!&#'!.0!E((:!1&$#(.)!&.!7(&).!T!;((.!&:&%.!
&.!&77!.21()!
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o *!(&34!3672#'%23&7!%&%(!(&%.4!1&$#(.)!/)('!.0!.().!.4(!0<C(3.)8!KB2$2+E(6!a!\Vb+*RR\+_B-!`R8T,!
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M.&.20#!Q!–!G(#)()!G&=!!!
o *V8W!2#34!70#$-!c!2#34!30::(%!:2:(8!!>4(!7(#$.4!&#'!'2&1(.(%!&%(!#0.!3%2.23&776!21:0%.&#.d!2.!1/).!
<(!).%&2$4.-!70#$!(#0/$4!.0!)((!.4(!(;;(3.-!</.!)2$#2;23&#.76!)40%.(%!.4&#!.4(!4(2$4.!0;!&!)./'(#.-!
&#'!0;!&!'2&1(.(%!)/;;232(#.!;0%!.4(!%&%(!(&%.4!1&$#(.)!.0!;&77!/#0<).%/3.('8!!*V8V!2#34()!=&)!
selected to be able to fit in a “copy paper box” for easy storage. F” diameter copper pipe is
typical, but G” will work Iust as well. !
o *V8W!2#34!70#$!:7&).23!:2:(!–!&$&2#!'21(#)20#)!&%(!#0.!3%2.23&78!!"'(&776-!.4(!2#)2'(!'2&1(.(%!0;!.42)!
:2:(!=0/7'!<(!F”-!.4(!)&1(!&)!.4(!30::(%!:2:(8!!U/.!2;!0.4(%!1&.(%2&7)!&%(!%(&'276!&5&27&<7(-!)/34!
&)!3/4” PVC pipe-!&!'2;;(%(#.!'2&1(.(%!=0/7'!=0%E!&)!=(778!
o T!(&34!3672#'%23&7!%&%(!(&%.4!1&$#(.)8!!>4()(!=277!%(1&2#!.0$(.4(%!&)!&!)2#$7(!1&$#(.!1&'(!/:!0;!
.4()(!.4%((!1&$#(.)!.4%0/$40/.!.4(!&3.252.68!KB2$2+E(6!a!\Vb+*RR\+_B-!`R8T,!(&34N!
M.&.20#!T!–!O/%2(!.(1:(%&./%(!e!O/%2(!A#$2#(!–!I(%%21&$#(.2)1!K<(4&5()!1/34!72E(!&!:&%&1&$#(.23!
1&.(%2&7N!
o 5” x 1.5” x 1/4” wood!
o 4 G” x 1 F” x G” wood!
o 3 F” x G” x G” wood!
o *!.(&!72$4.!3&#'7(!Kf0&##!a!VW,Qb,W!+!!*RR!:&3E!`b8bbN!
o T!2#34()!0;!QQFYJ!30::(%!=2%(!K$&/$(!2)!#0.!3%2.23&7-!QRFYJ!0%!Q\FYJ!)40/7'!=0%E!;2#(8!!
o I(%%2.(!<(&'!KB2$2+E(6!a!Q\R+QQbR+_B!`R8QVN!
o Small (T1/4”) steel washer!
M.&.20#!\!–!_0%.4!0%!)0/.4-!%2$4.!4&#'!%/7(!
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)&75&$('!1&$#(.!=2%(-!=2%(!=%&:!=2%(!0%!0.4(%!.42#!=2%(N!
o *!:(#327!
o 1 scrap piece of Styrofoam (about 4”x4”x1” –!(@&3.!)2H(!2)!#0.!3%2.23&7N!
o B0/<7(!)2'('!.&:(!–!.0!407'!.4(!1&$#(.!2#!:7&3(!
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M.&.20#!V!–!B2&1&$#(.2)1!
o \!(&34!+!F” x F” x F” rare earth magnet (CMS Magnetics –!*R!:&3E!`Q*8VbN!–!'0!#0.!'2)3&%'!.4(!
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Plan
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#0.!&!37&))!)(.!0;!(&34!).&.20#8!!M./'(#.)!=277!=0%E!&.!(&34!0;!.4(!V!).&.20#)!;0%!&<0/.!*eV!0;!.4(!37&))!
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<&)(-!/:0#!various “non+magnetic” materials.!
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insulating pipe (plastic) and a “non+magnetic” conducting pipe.!!M./'(#.)!#0.(!.4(!)2127&%2.2()!&#'!
differences between the two materials and use their knowledge of Lenz%s Law to explain the effect.!
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M.&.20#!TD!!M./'(#.)!(@:70%(!.4(!(;;(3.!0;!.4(!O/%2(!.(1:(%&./%(!of “magnetic” materials. Students will
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400E!.0!.4(!.0:!0;!.4(!400E!0#!.4(!0.4(%!(#'8!!G00:!.4(!.0:!700:!.4%0/$4!.4(!(6(7(.!&.!.4(!.0:!0;!.4(!
(#$2#(!&#'!)72:!&!;(%%2.(!<(&'!05(%!.4(!<0..01!400E8!!OFX>"?_!–!2;!the bead slips out of the student%s
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that is, does “your north” attract 0%!%(:(7!&#0.4(%!$%0/:)!#0%.4Z!!>4(!B!3(77!2#!)(%2()!=2.4!&!*W!041!
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Summary
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the lab within 55 minutes will require students to hit the ground running and “play” and discuss guiding
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students to the macroscopic effect of conducting materials in the presence of a magnetic field (Lenz%s Law).
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nuances of what it means for a material to be “magnetic” and the competing effects of magnetic ordering and
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Appendix A – Details on manipulatives
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Appendix B – Guiding Ruestions
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