trial stpm p2 2016 with answer

8/18/2019 TRIAL STPM P2 2016 With Answer

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SECTION A [15 MARKS]

Answer all questions in this section.

1. Two point charges +5!C an" M are p#ace" $$ c% apart. I& the' attract each other with a

&orce o& $.5(5 N) what is the charge M*

Dua cas titik +35 μC dan M diletakkan sejauh 300 cm. Jika cas itu saling menarik dengandaa 0.5!5 "# $era%akah cas $agi M&

A +1, !C - +15 !C C 15 !C / 1, !C

(. Three positi0e point charges each o& %agnit"e 2 are p#ace" one a&ter another at each

corner o& an e3i#atera# triang#e o& si"e 4. hat is the tota# potentia# energ' o& the s'ste%

o& charges*

'iga cas titik %ositi( setia% satu $ermagnitud ) diletakkan satu demi satu %ada setia%

%enjuru satu segi tiga sama sisi $ersisi *. era%akah jumlah tenaga keu%aaan $agi

sstem ca situ& A 3 P

4 π ε0

x

B 3 P2

4 π ε0 x

C 3 P

4 π ε0 x2

❑/ 3 P

2

4 π ε0

x2

❑

. Three capacitors C1) C( an" C are connecte" in series to a 6atter' as shown in the

"iagra% 6e#ow.

'iga ka%acitor C ,# C ! dan C 3 disam$ung secara siri ke%ada satu $ateri se%erti angditunjukkan dalam gam$ar rajah di $awah

The capacitans o& each capacitor are (!7) !7 an" 8!7 respecti0e#'. hich state%ent

a6ot the circit is tre*

-a%asitans $agi setia% ka%asitor masingmasing ialah !μ/# 3μ/ dan μ/. )ernataan

ang manakah ang $enar tentang litar itu&

A The e3i0a#ent capacitance is 9 !7.

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-a%asitans setara ialah 1 μ/.- The charge in capacitor C is the 6iggest.

Cas %ada ka%asitor C 3 adalah ang %aling $esar .C The potentia# "i&&erence across C1 is the 6iggest.

e2a keu%aaan merentas C , adalah ang %aling $esar./ The energ' store" in capacitor C is greater than that o& capacitor C(.

'enaga ang tersim%an dalam ka%asitor C 3 adalah le$ih $esar dari%ada tenaga

ang tersim%an dalam ka%asitor C !.

8. The increase in the e#ectrica# resisti0it' o& a %eta##ic con"ctor when its te%peratre is

increase" is "e to the increase in

)eningkatan kerintangan elektrik satu konduktor logam a%a$ila suhuna dinaikkan adalah

dise$a$kan oleh %ertam$ahan dalam A The "ri&t 0e#ocit' o& its e#ectrons

alaju hanut elektronB Its a%p#it"e o& #attice 0i6rations

Am%litude getaran kekisinaC Its %ean &ree ti%e 6etween co##isions

Min masa $e$as antara %erlanggaranna/ Its n%6er o& &ree e#ectrons per nit 0o#%e

ilangan electron $e$as %er isi %adu unitna

5. A networ: resistors connecte" to an a%%eter an" a ce## o& e.%.& .$ ; o& neg#igi6#e

interna# resistance is shown in the circit 6e#ow.

4uatu rangkaian %erintang disam$ungkan ke%ada satu ammeter dan satu sel dengan

d.g.e .06 ang mem%unai rintangan dalam ang $oleh dia$aikan ditunjukkan dalam litar

di atas.

hat is the rea"ing o& the a%%eter in the circit*

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era%akah $acaan ammeter litar itu& A .$ A - 8.$ A C (.8 A D 1.( A

. The "ri&t 0e#ocit' o& &ree e#ectrons in a con"ctor iss 0er' s%a##) 6t a 6#6 can 6e #it p

a#%ost i%%e"iate#' a&ter the switch is c#ose". hich state%ent e4p#ains this sitations*

alaju hanut electron $e$as dalam satu kunduktor adalah sangat kecil# teta%i satu

mentol ham%er da%at dinalakan sertamerta sele%as suis ditutu%. )ernataan ang

manakah ang da%at menjelaskan situasi ini& A The %ass o& an e#ectrons in 0er' s%a##

Jisim electron adalah sangat kecil - The ran"o% spee" o& &ree e#ectrons is high

7aju rawak electron $e$as adalah tinggi C 7ree e#ectrons %o0e with the spee" o& #ight

8lektron $e$as $ergerak dengan laju cahaaD A## &ree e#ectrons "ri&t si%#taneos#'

4emua electron $e$as hanut serentak

,. hich graph shows the 0ariation o& resisti0it' < with te%peratre T o& a spercon"ctor*

9ra( ang manakah ang menunjukkan u$ahan kerintangan : dengan suhu ' satu

su%erkonduktor& A -

C /

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=. Two 6atteries o& e.%.& E1 an" E( an" a rheostat R are connecte" in a circit are shown in

the "iagra% 6e#ow.

Dua $uah $ateri dengan d.g.e 8 , dan 8 ! dan se$uah rheostat ; disam$ungkan dalam

satu litar ditunjukkan dalam rajah di $awah

The rheostat is a">ste" nti# the rea"ing o& the a%%eter 6eco%es ?ero. I& R is 5.$ @ an"

E( is 8.$ ;) what is the 0a#e o& E1*

;eostat itu dilaraskan sehingga $acaan ammeter menjadi si(ar. Jika ; ialah 5.0 < dan 8 !

.0 6# $era%akah nilai 8 ,& A $.5, ; B $.=$ ; C 1.8 ; / (.$$ ;

9. Two #ong wires - an" C which are separate" 6' a "istance o& $.$= % in a 0ac%) an"

carr'ing crrents o& (.$ A an" 8.$ A respecti0e#' in the sa%e "irection are shown in the

"iagra% 6e#ow.

Dua dawai %anjang dan C ang ter%isah %ada jarak 0.0= m dalam satu >akum# dan

masingmasing mem$awa arus !.0 A dan .0 A dalam arah ang sama ditunjukkan dalam

gam$ar rajah di $awah.

I& is &i4e" 6t C is &ree to %o0e) what is the &orce per nit #ength an" its "irection that

%st 6e app#ie" to C to pre0ent it &ro% %o0ing*

Jika adalah teta% teta%i C adalah $e$as $ergerak# $era%akah daa %er unit %anjang dan

arahna ang mesti dikenakan ke%ada C untuk menghalangna dari%ada $ergerak&

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A (.$ 4 1$5 N%1) towar"s -B (.$ 4 1$5 N%1) awa' &ro% -C 1.$ 4 1$5 N%1) towar"s -/ 1.$ 4 1$5 N%1) awa' &ro% -

1$

.

A %eta# con"ctor o& #ength 8$.$ c% which is 6eing %o0e" with a constant 0e#ocit' o&

1$.$ %s1 6' a constant &orce / in a ni&or% %agnetic &ie#" o& =.$ T shown in the "iagra%

6e#ow.

4atu kunduktor logam dengan %anjang 0.0 cm ang digerakkan dengan halaju malar

,0.0 ms, oleh daa malar / dalam medan magnet seragam =.0 ' ditunjukkan dalam

gam$ar rajah di $awah.

The en"s o& the con"cting trac: which has neg#igi6#e resistance is connecte" to a

resistor o& 5.$ @. hat is the %agnit"e o& &orce /&

ujung landasan %engkonduksi ang rintanganna $oleh dia$aikan disam$ung ke%ada

%erintang 5.0


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I%%e"iate#' a&ter S is c#ose") the crrent throgh the #oop changes at a rate o& 1( As 1)

an" the e.%.&. in"ce" in the #oop has %agnit"e o& 5.$ ;. hat is the se#&in"ctance o&

the #oop*

4ejurus sele%as suis 4 ditutu%# arus melalui gelung itu $eru$ah %ada kadar ,! As ,# and

d.g.e. teraruh dalam gelung itu mem%unai magnitude 5.0 6. era%akah ? se#&in"ctance

ge#ng it*

A (.$ B B (.8 B C .8 B / 8.$ B

1(. A s%a## coi# with 1$$$ trns o& crosssectiona# area 1.(5 4 1$ %( is p#ace" coa4ia##' at

the centre o& a so#enoi" with 8$$$ trns an" #ength (.== %. hat is the %ta#

in"ctance 6etween the so#enoi" an" the coi#*

4atu gegelung kecil dengan lilitan ,000 lilitan dan luas keratan rentas ,.!5 * ,0 3 m!

diletakkan se%aksi %ada %usat solenoid dengan 000 lilitan dan %anjang !.== m.

era%akah induktans saling antara solenoid dengan gegelung itu&

A (.1= 4 1$ B - 1.95 4 1$8 B C (.=8 4 1$ h / .89 4 1$ B

1

.

The 0ariation o& 0o#tage 6 an" crrent I with ti%e t when an a#ternating crrent ows

throgh a certain e#ectrica# co%ponent is shown 6' the graph 6e#ow.

@$ahan >oltan 6 dan arus I dengan masa t a%a$ila arus ulangalik mengalir melalui

suatu kom%onen elektrik tertentu ditunjukkan oleh gra( di $awah.

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hich state%ent is not tre o& the co%ponent*

)ernataan manakah ang tidak $enar tentang kom%onen itu& A The co%ponent is an in"ctor

-om%onen itu adalah satu induktor - The net power "issipate" 6' the co%ponent is ?ero

-uasa $ersih ang dilesa%kan oleh kom%onen itu ialah si(ar

C The reactance o& the co%ponent is in"epen"ent o& the &re3enc';eaktans kom%onen itu adalah tak $ersandar dengan (rekuensi

/The 0o#tage across the co%ponent a#wa's #ea"s the crrent 6'

π

2rad

6oltan ang merentas kom%onen itu sentiasa mendahului arus se$anakπ

2rad

.

18. The 0ariation o& the instantaneos power 2 "issipate" 6' a heating coi# with ti%e t when a

sinsoi"a# crrent ows throgh the heating coi# is shown in the graph 6e#ow.

@$ahan kuasa seketika ) ang terlesa% oleh gegelung %emanasan dengan masa t

a%a$ila suatu arus sinusoidal mengalir melalui gegelung %emanasan itu ditunjukkan

dalam gra( di $awah.

I& the resistance o& the coi# is ($$ @) what is the r.%.s crrent owing throgh the coi#*

Jika rintangan gegelung ialah !00


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15

.

A capacitor is connecte" to an a.c sorce with a pea: 0o#tage 85 ; an" a &re3enc' o& =$

B?. I& the capacitance is .( !7) what is the pea: crrent in the circit*

4atu ka%asitor disam$ungkan ke%ada satu sum$er a.u dengan >oltan %uncak 5 6 dan

(rekuensi =0 2. Jika ka%asitans ialah 3.! μ/# $era%akah arus %uncak litar itu& A ((.85 %A B (,.9, %A C .( %A / ,(.9 %A

SECTION B [15 marks]

Answer all questions in this section.

1. aD -' sing asss #aw) "eri0e e4pression &or an e#ectric &ie#" which is "e to a

ni&or%#' charge" con"cting p#ate o& area A in a &ree space. The tota# charge on

the p#ate is F. [8 %ar:s]

Dengan me$ggunakan hokum 9auss# ter$itkan satu ungka%an $agi suatu medan

elektrik ang dise$a$kan oleh %lat %engkonduksi ang $ercas seragam ang

mem%unai luas A dalam ruang $e$as. Jumlah cas %ada %lat ialah . B markah

6

D

A charge partic#e o& 85.$ !C is p#ace" in a ni&or% e#ectric &ie#" o& (.( 4 1$5 NC1.

/eter%ine

4atu 2arah $ercas 5.0 μC diletakkan dalam satu medan elektrik ang seragam

!.! * ,0 5 "C ,.10


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'entukaniD The &orce e4erte" on the charge" partic#e) [( %ar:s]

Daa ang dikenakan %ada 2arah $ercas itu.

iiD The wor: which is re3ire" to %o0e the charge" partic#e to a "istance 5.$$ c%

against the "irection o& the e#ectric &ie#". [( %ar:s]

-erja ang %erlu dilakukan umtuk menggerakkan 2arah $ercas itu sejauh

5.00 cm melawan arah medan elektrik.

1,

.

a

D

State two &actors which a&&ect the resisti0it' o& a con"cting %ateria#. [( %ar:s]

"atakan dua (actor ang mem%engaruhi kerintangan satu $ahan %engkonduksi.

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6D iD Show that the con"cti0it' o& a con"cting %ateria# can 6e e4presse" as

σ =n e

2

τ

m # where n is the num$er o( (ree electron# e is the charge o( an

electron# m is the mass o( an electron and τ is the mean time $etween

collision o( (ree electrons and %ositi>e ions.

B marks

'unjukkan $ahawa kekonduksian satu $ahan %engkonduksi da%at

diungka%kan se$agai σ =n e

2

τ

m #

Dengan n ialah $ilangan electron $e$as# e cas electron# m jisim electron dan

τ min masa antara %erlanggaran electron $e$as dengan ion %ositi(. B

markah

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iiiD Copper has a resisti0it' o& 1.=9 4 1$= @ % an" a &ree e#ectron "ensit' o&

=.=5 4 1$(= %. Esti%ate the %ean ti%e 6etween the co##isions o& &ree e#ectrons

an" positi0e ions in copper. [( %ar:s]

-u%rum mem%unai kerintangan ,.=1 * ,0 = < m "an :et%patan e#ectron

6e6as =.=5 * ,0 != m3. Anggarkan min masa %erlanggaran antara electron

$e$as dengan ion %ositi( dalam ku%rum. B! markah

Bahagian C [30 markah]

Jawa$ manamana dua soalan dalam $ahagian ini.

1=

.

a

D

E4p#ain wh' a goo" %o0ing coi# a%%eter has a #ow resistance whi#e a goo" %o0ing

coi# 0o#t%eter has a high resistance. [8 %ar:s]

Jelaskan menga%a ammeter gegelung $ergerak ang $aik mem%unai rintangan

ang rendah# manakala >oltmeter gegelung $ergerak ang $aik mem%unai

rintangan ang tinggi. B markah

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Circit G Circit H

iD E4p#ain wh' the 0a#e o& the resistance R "eter%ine" is not accrate in each

case* [( %ar:s]

'erangkan menga%a nilai rintangan ; ang ditentukan adalah tidak jitu dalam

setia% kes& B! markah

iiD E4p#ain wh' each circit is a 6etter wa' o& "eter%ining a s%a## resistance.

[( %ar:s]

Jelaskan litar ang manakah meru%akan cara ang le$ih $aik untuk

menentukan rintangan ang kecil. B!

markah

cD A potentio%eter which is se" to "eter%ine the interna# resistance an" the e.%.& o&

a "r' ce## E( is shown in the "iagra% 6e#ow.

4atu %otentiometer ang digunakan untuk menentukan rintangan dalam dan d.g.esatu sel kering 8 ! ditunjukkan dalam gam$ar rajah di $awah.

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The e.%.& o& the "ri0er ce## E1 is (.$ ; with neg#igi6#e interna# resistance. The

0aria6#e resistor R1 is set at 1.$ @ an" the s#i"e wire M which is 1$$ % #ong an"

has a resistance o& .$ @. The resistor R( has a resistance o& 5.$ @. hen the

switch S is opene") the 6a#ance #ength G is 9$.$ c%) an" when the switch S is

c#ose" the 6a#ance #ength changes to =$.$ c%.

D.g.e sel %emacu 8 , ialah !.0 6 dan mem%unai rintangan dalam ang $oleh

dia$aikan. )erintang $oleh u$ah ; , dilaraskan %ada ,.0 < dan dawai gelongsor 7M

ang %anjangna ,00 cm mem%unai rintangan 3.0


14/16

Ca#c#ate

itung iD The ti%e constant o& the circit

)emalar masa litar [( %ar:s]iiD The potentia# "i&&erence across the capacitors a&ter 5$$ s. [( %ar:s]

e2a keu%aaan #merentasi ka%asitorka%asitor itu sele%as 5$$ s.iii

D

The &ina# charge on the capacitor.

Cas akhir %ada setia% ka%asitor [ %ar:s]6D The 6atter' is re%o0e" an" rep#ace" 6' a switch is then c#ose" at ti%e tJ$.

hat is the crrent in the (.$ M@ resistor at the instant the switch is c#ose"*

ateri itu ditanggalkan dan digantikan dengan suatu suis. 4ui situ kemudian

ditutu% [( %ar:s]

cD On the sa%ea4is) s:etch graphs to show the 0ariation with ti%e

iD The crrent in the resistor

iiD The charge on the ($ !7

iii

D

The charge on the 5$ !7

Mar: the respecti0e 0a#e at ti%e tJ$.

($. aD /istingish 6etween a "irect crrent an" an a#ternating crrent [( %ar:s]

e2akan antara arus terus dengan arus ulangalik.6D The otpt o& an a.c spp#' is gi0en 6' the e4pression V =50sin 9000 t )

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where ; is in 0o#ts an" t in secon"s. Ca#c#ate

Fut%ut $ekalan a.u di$erikan oleh ungka%an V =50sin9000 t , dengan 6 dalam

>olt dan t dalam saat. itung iD The %a4i%% 0o#tage)

6oltan maksimum# B, mark

iiD The r.%.s 0o#tage

6oltan %.m.k.d B! marks iiiD The &re3enc' o& the crrent spp#'

/rekuensi $ekalan arus itu B! marks cD A capacitor o& capacitance ($$ !7 an" a resistor o& resistance 1$$ @ which are

connecte" in series to an a.c spp#' o& r.%.s 0o#tage ;s o& (8 ; with a &re3enc' o&

5$ B? are shown in the circit 6e#ow.

4atu ka%asitor dengan ka%asitans !00 μ/ dan %erintang dengan rintangan ,00 <

ang disam$ungkan secara siri ke%ada $ekalan arus a.t dengan >oltan %.m.k.d 6 s

! 6 $er(rekuensi 50 2 ditunjukkan dalam litar di $awah.

iD Ca#c#ate the r.%.s crrent o& the circit

itung arus %.m.k.d litar itu. B marks iiD Ca#c#ate the r.%.s 0o#tage across the resistor ;R an" the r.%.s 0o#tage across

the capacitor ;C.

itung >oltan %.m.k.d merentas %erintang 6 ; dan >oltan %.m.k.d merentas

ka%asitor # 6 C. B! marks iiD State the re#ationship 6etween ;R) ;C an" ;S. i0e a reason &or 'or answer.

"atakan hu$ungan antara 6 ; # 6 C dan 6 4. erikan satu se$a$ $agi jawa%an

anda. B! marks

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EN/ O7 FESTIONS

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trial stpm p2 2016 with answer

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