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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    :

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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

    [email protected] 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