Download - Investigatory Physics
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GROUP
MEMBERS:
FARZEEna v l
Aparna v k
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THEORY
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Diamagnetic material
#n t*e a'ence o2
appl!ed magnet!c 3eld4eac* atom *a' net 5ero
magnet!c d!pole
moment.)*e'e !nd$ced
magnet!c d!pole
moment' al!gn
t*em'elve' oppo'!te to
t*e appl!ed 3eld.
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)*$'4 6m 7 8 and 9r
7 1.
Paramagnetic
Materials
#n t*e a'ence o2 appl!ed
magnet!c 3eld4 eac* atom
*a' net non5ero ;$t
weak< magnet!c d!polemoment.
)*e'e magnet!c d!pole'
moment' are randoml+
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or!ented 'o t*at t*e net
macro'cop!c
magnet!5at!on !' 5ero. #n t*e pre'ence o2 an
appl!ed magnet!c 3eld4
t*e magnet!c d!pole' al!gn
t*em'elve' w!t* t*e
appl!ed 2!eld 'o t*at 6m =
8 and 9r = 1.
Paramagnet!c mater!al'are ;weakl+< attracted to
e!t*er pole o2 a magnet.
Ferromagnetic
Materials
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Ferromagnet!c mater!al'
!ncl$de !ron4 n!ckel and
coalt #n t*e a'ence o2 appl!ed
magnet!c 3eld4 t*e doma!n'
are randoml+ or!ented 'o
t*at t*e net macro'cop!cmagnet!5at!on !' 5ero.
#n t*e pre'ence o2 an appl!ed
magnet!c 3eld4 t*e doma!n'
al!gn t*em'elve' w!t* t*eappl!ed 3eld.
)*e e>ect !' a ver+ 'trong
one w!t* 6m == 8 and 9r ==
1. Ferromagnet!c mater!al' are
'trongl+ attracted to e!t*er
pole o2 a magnet.
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Ao$t t*e apparat$'...
Variable Gap Magnet.
)*!' apparat$' con'!'t' o2 two 8mm
d!ameter neod+m!$m magnet' 3tted on
two ad?$'tale !ron *older' on metall!c
a'e. One can ea'!l+ ad?$'t t*e 3eld
'trengt* !n etween t*e two magnet' +
?$'t rotat!ng kno' prov!ded on t*e
e@treme end'. )wo at pole p!ece' are
al'o !ncl$ded to prov!de a $n!2orm
magnet!c 3eld w*en needed.
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im
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PROCED!RE
1. Ad?$'t t*e gap etween t*e pole
p!ece' to ao$t 1 mm and '$'pend
t*e 'ample o2 metal $nder
!nv!g!lat!on etween t*e'e.
". )!e p!ece' o2 t*read aro$nd t*e'ample and 'ec$re t*e t*read w!t* a
'mall p!ece o2 tape to prevent t*e
'ample 2rom 'l!pp!ng o$t o2 t*e
t*read loop.
#. ang t*e 'ample 2rom a 'tand 'o!t !' at t*e 'ame level a' t*e Car!ale
Gap Magnet w*en t*e magnet !'
placed on !t' '!de .%. are2$ll+ ad?$'t t*e po'!t!on o2
t*e 'ample '$c* t*at !t make' an
angle o2 %(D w!t* 3eld d!rect!on.(. Grad$all+ !ncrea'e t*e c$rrent
t*ro$g* t*e co!l + t$n!ng voltage
ad?$'tment kno !n t*e clockw!'e
d!rect!on.
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,. O'erve t*e e*av!o$r o2 t*e
'ample $nder o'ervat!on.
RE$!%REMENTS
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O&SERVT%ON
SMP'E &EHV%O!R OF
THE SMP'EB#SMU)
;!amagnet!
c