EXTENDED ESSAY PHYSICS Kristian Ballabani 2nd (1)With Changes n
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Transcript of EXTENDED ESSAY PHYSICS Kristian Ballabani 2nd (1)With Changes n
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Kristian BallabaniExtended Essay in Physics May 2012
Extended Essay in Physics
An Investigation into Eddy Currents
Kristian Ballabani
Candidate Number: 000017-xxx
May 2012
Word count: 3892
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Kristian BallabaniExtended Essay in Physics May 2012
Abstract
Electromagnetism is present everywhere in our everyday life !ne of these
electromagnetic phenomena is Eddy currents "n interesting use of Eddy
currents in everyday life is what is called the #Eddy current bra$ing%. !is essay
in"esti#ates t!e re$ations!i% bet&een "o$ta#e across a coi$ t!at is
%roducin# a ma#netic 'e$d( and t!e time it ta)es *or an a$uminium
s!eet osci$$atin# t!rou#! t!e 'e$d to be brou#!t to a sto%.
&n order to ac'uire accurate data( a lot of time measurements were ta$en at
di)erent voltages Pendulums made of aluminium( with slots cut on them were
used and their si*e was $ept the same throughout the experiment +ubricant oil
and a bearing were also used to reduce friction
,he analysed results and the graphs plotted from the data collected show a
decrease of the decaying time when the voltage increases -econdly( an increaseof the decaying time is shown whilst an increase of the number of slots on the
aluminium sheets occurs ,he decaying time decreases exponentially when the
voltage across the coil is increased ,his statement was proven throughout the
investigation Moreover( a slower bra$e arises when the number of slots
increases
,he decrease in the decaying time is due to stronger magnetic .elds( inducing
stronger currents that oppose the motion of the pendulum ,hese stronger
magnetic .elds occur at higher voltages ,he slots do not allow the Eddy currents
to form( thus ma$ing the damping e)ects wea$er/ wea$er damping means a
bigger decaying time
My extended essay gives a full analysis of the data and presents two di)erent
proofs to support my argument it also presents a more detailed conclusion and
evaluation of the investigation
Word count 23 words
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Kristian BallabaniExtended Essay in Physics May 2012
Content +a
#e"bstract888888888888888888888888888888888
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"c$nowledgements8888888888888888888888888888
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&ntroduction8888888888888888888888888888888
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,heoretical
bac$ground8888888888888888888888888888888
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Experimental setupa ,he
e'uipment88888888888888888888888888888
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b ,he
variables88888888888888888888888888888
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c ,he experimental
procedure
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;ypothesis88888888888888888888888888888888
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"nalysis of raw
data88888888888888888888888888888888888
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a ,heoretical
proof8888888888888888888888888888888
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b ,he data/based
proof8888888888888888888888888888888
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4onclusion88888888888888888888888888888888
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Evaluation88888888888888888888888888888888
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Bibliography8888888888888888888888888888888888888
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