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© Mana Tohu Mātauranga o Aotearoa, 2018. Pūmau te mana. Kia kaua rawa he wāhi o tēnei tuhinga e whakahuatia ki te kore te whakaaetanga tuatahi a te Mana Tohu Mātauranga o Aotearoa.

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Ahupūngao, Kaupae 1, 201890937M Te whakaatu māramatanga ki ētahi āhuatanga

o te hiko me te autō

2.00 i te ahiahi Rāmere 23 Whiringa-ā-rangi 2018 Whiwhinga: Whā

Paetae Kaiaka KairangiTe whakaatu māramatanga ki ētahi āhuatanga o te hiko me te autō.

Te whakaatu māramatanga hōhonu ki ētahi āhuatanga o te hiko me te autō.

Te whakaatu māramatanga matawhānui ki ētahi āhuatanga o te hiko me te autō.

Tirohia mēnā e rite ana te Tau Ākonga ā-Motu (NSN) kei runga i tō puka whakauru ki te tau kei runga i tēnei whārangi.

Me whakamātau koe i ngā tūmahi KATOA kei roto i tēnei pukapuka.

Tirohia mēnā kei a koe te Rau Rauemi L1–PHYSMR.

Ki roto i ō tuhinga, whakamahia ngā whiriwhiringa tohutau mārama, ngā kupu, ngā hoahoa hoki, tētahi, ētahi rānei o ēnei, ki hea hiahiatia ai.

Me hoatu te wae tika o te Pūnaha Waeine ā-Ao (SI) ki ngā tuhinga tohutau.

Mēnā ka hiahia whārangi atu anō koe mō ō tuhinga, whakamahia ngā whārangi wātea kei muri o tēnei pukapuka, ka āta tohu ai i te tau tūmahi.

Tirohia mēnā e tika ana te raupapatanga o ngā whārangi 2 –23 kei roto i tēnei pukapuka, ā, kāore tētahi o aua whārangi i te takoto kau.

ME HOATU RAWA KOE I TĒNEI PUKAPUKA KI TE KAIWHAKAHAERE Ā TE MUTUNGA O TE WHAKAMĀTAUTAU.

Ahupūngao 90937M, 2018

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TŪMAHI TUATAHI: WHAKAHIKO VAN DE GRAAFF

(a) Eruangāahanoakonganukukuawhaiwhanatōrunga.Eōriteanatetuariotewhanaitemataoteahanoaporowhita,eaikitewhakaaturanga.

Tātuhiatetuaritangawhanaheiwhakaatuhepēheatetuariingāwhanatōrungaitemataoteahanoakonganukueharaiteporowhita.

Ahanoa konganuku porowhita

Ahanoa konganuku ehara i te porowhita

(b) Mewhakamāramaheahaipaiaitekonukuraheipūkawehiko,ā,hekoretaketekarāheheipūkawehiko.

Ki te hiahia koe ki te tuhi anō i tēnei hoahoa, whakamahia te hoahoa i

te whārangi 20.

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QUESTION ONE: VAN DE GRAAFF GENERATOR

(a) Belowaretwo positively chargedmetalobjects.Theroundobjecthaschargeevenlydistributedoverthesurface,asshown.

Drawthechargedistributiontoshowhowthepositivechargesaredistributedalongthesurfaceofthenon-roundmetalobject.

Round metal object

Non-round metal object

(b) Explainwhycopperisagoodconductorofelectricity,whereasglassisapoorconductorofelectricity.

If you need to redraw this, use the diagram on

page 21.

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HewhakahikohikotūtewhakahikoVandeGraaffewhakamahianaitētahitātuanekenekeheiwhakaemiwhanahikokeitētahipoikonganukuhākaro,enohoanairungaitētahipouāraihiko.IhangaiatewhakahikoVandeGraaffāraiā-haunuirawaoteaoingātau1930.KeiteWhareTaongaPūtaiaooBostonewhakaaturiaanaināianei.

KataeaetewhakahikoVandeGraafftewhakaputate2.0MV(2.0×106V).Itewāotētahiwhakaaturanga,he0.001steroaotekāotētahikora.He100kJ(1.0×105J)tepūngaoikaweaetauakora.

https://en.wikipedia.org/wiki/Van_de_Graaff_generator#/media/File:Boston_Museum_of_Science,_Theater_of_Electricity.jpg

(c) (i) Metātaiiterahingaoteiahikoerereanaitekora.

(ii) Hetinomōreareangāiahikoirungaakeite100mAmōtetangata.

Mewhakamāramamēnāhehaumaruteiahikokaputaitēneiwhakaaturanga, kāorerānei.

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AVandeGraaffgeneratorisanelectrostaticgeneratorthatusesamovingbelttoaccumulateelectricchargeonahollowmetalglobe,whichsits onthetopofaninsulatedcolumn.Thelargestair-insulatedVandeGraaffgeneratorintheworldwasbuiltinthe1930s.ItisnowondisplayatBoston’sMuseumofScience.

TheVandeGraaffgeneratorcangenerate2.0MV(2.0×106V).Duringademonstration,asparkwasmeasuredtolastfor0.001s.Thesparkcarried100kJ(1.0×105 J)ofenergy.

https://en.wikipedia.org/wiki/Van_de_Graaff_generator#/media/File:Boston_Museum_of_Science,_Theater_of_Electricity.jpg

(c) (i) Calculatetheamountofcurrentthatflowsduringthespark.

(ii) Electricalcurrentsabove100mAareextremelyhazardousforhumans.

Explainwhetherornotthecurrentcreatedbythisdemonstrationissafe.

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(d) KawhakamahiahewhakahikoVandeGraaffitiakemōtētahimahingaakomanga.KarauaetekaiakoheipumengāpōropūkawehikoirotokirungaakeitewhakahikoVandeGraaff,eaikitepikitia.Hekōpaekonganukukeirungamerarooteipu.Kātahikawhakapāiaitepoiehonoanakitepapakitetaharungaoteipu.Kātahikatīmatangāpōrokitetāwhanawhanaiwaengaingākōpaekonganukuorungameraro.EkīiaanaheVoltaHailstormtēnei.

Mewhakamāramamaiheahaitāwhanawhanaaingāpōroiwaengaingākōpae.

Itōtuhingame:

• whakamāramaheahainekeaingāpōrokitekōpaeorungaitetuatahi

• whakamāramaheahangāpōroitakaaikiraroimurimai.

ngā kōpae konganuku

Whakahiko Van de Graaff

ngā pōro pūkawe hiko

ngā taha ārai hiko

pūata

KĀORE i tuhi ā-āwhatatia tēnei hoahoa

He wāhi anō mō tō tuhinga mō tēnei tūmahi kei te whārangi 8.

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(d) AsmallerVandeGraaffgeneratorisusedforaclassactivity.TheteacherplacesacontainerofconductiveballsontothetopoftheVandeGraaffgenerator,asshowninthepicture.Thetopandbottomofthecontainercontainmetaldiscs.Theythentouchthegroundsphereagainstthetopofthecontainer.Theconductiveballsstarttobouncebackandforthbetweenthetopandbottommetaldiscs.ThisiscalledaVoltaHailstorm.

Explainwhytheballsbouncebackandforthbetweentheplates.

Aspartofyouransweryoushould:

• explainwhytheballsinitiallymovetowardsthetopplate

• explainwhytheballsthenfallbackdown.

metal disks

Van de Graaff generator

conductive balls

clear insulated

sides

Diagram is NOT to scale

There is more space for your answer to this question on page 9.

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TŪMAHI TUARUA: PAEKŌHAO HIKO

HeDJaAndrew,ā,itenuingaotewāmewhaikōhaohikomahaiaheiwhakakāianautautamengārama.KahonomaiaAndrewitepaekōhao,ewhakaaturiaanaitetahamatau,kitētahikōhaohikopātūetukuanaite240V.Kātahikahonomaiiaingāramaritepūewhā,ā,e60Wtekahahikooiarama.Etūhonowhakararatiaanatepaekōhaohikoingāwākatoa.

(a) Mewhakamāramaheahatetakemetūhonowhakararatepaekōhaohiko.

(b) KatūhonoaAndrewingārama60Writepūewhākiawhakararametētahipunahiko240VDCheiwhakamātautau,eaikitehoahoairaro.

240 V A B C D

all lights are identicalhe ritepū ngā rama katoa

Whakaaturiamātetātaikoteiahikoerereanaitētahiongāramahe0.25A.

(c) KawhakakapiatepūramaCkitētahipūramapenapena-hikoeitiaketewhakataurangahikoitōteramatuatahi,engariheōritetetīaho.

Mewhakamāramamēnāheteiteiake,pakuakerāneiteparengaiahikootepūramapenapena-hikoiteramatuatahi.

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(d) IwhakariteaAndrewkitewhakakapiingāramakatoaewhākingāpūramapenapena-hiko. Itetutukitangaotēnei,he0.20Ateiahikotapekemōngāramakatoaewhā.

Tātaihiatepūngaohikoewhakapetoaanaetētahipūramapenapena-hikoKOTAHIirotoiteruahaorateroa,Ā,kawhakatauriteitēneikitepūngaokawhakapetoaetētahipūrama60VKOTAHIirotoiteruahaora.

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QUESTION TWO: POWER STRIP

AndrewisaDJ,andoftenneedsmultipleplugstopowerhisequipmentandlights.Andrewplugsthepowerstrip,asseenatright,intoawalloutletthatprovides240V.Hethenplugsinfouridenticallightseachwithapowerof60W.Apowerstripisalwayswiredinparallel.

(a) Describewhyapowerstripmustbewiredinparallel.

(b) Andrewconnectsfouridentical60Wlightsinparallelwitha240VDCpowersupplytotestthem,asshowninthediagrambelow.

240 V A B C D

all lights are identical

Showbycalculationthatthecurrentthroughoneofthelightsis0.25A.

(c) BulbCisreplacedbyanenergy-efficientlightthathasalowerpowerratingthantheoriginallight,buthasthesamebrightness.

Explainwhethertheenergy-efficientlightbulbhasahigherorlowerresistancethantheoriginallight.

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(d) Andrewdecidedtoreplaceallfourlightswithenergy-efficientlightbulbs.Whenthishappened,thetotalcurrentforallfourlightswas0.20A.

CalculatetheelectricalenergyusedbyONEenergy-efficientbulboveraperiodoftwohours,ANDcomparethiswiththeenergyusedbyONE60Wlightbulbovertwohours.

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TŪMAHI TUATORU: NGĀ PANAHIKO TĀNGA

Ewhakahaerehiaanatētahimīhini1whakaharuruwakaengāaraiahikomotuhakeerua;tearaiahikopōkaiwaea,heititeiahikoerereanairoto;metearaiahikowhakaharuruwaka,henuiteiahikoerereanairoto.Keirotoitētahipanatāngakotētahipōkaiwaeakarauakitetahaotētahipāngapanarino.Kawhakamahiatepāngapanarinoheiwhakahaereitemīhiniwhakaharuru. Ewhakaatuanatehoahoairaroneiingāaraiahikoerua.

pūhikopana whakaharuru me te kī whakakā

A

C D

B

mīhini whakaharuru

pōkai waeaara iahiko o te pōkai waea

ara iahiko o te mīhini whakaharuru

pānga pana rino

(a) (i) Kitehoahoairungaake,metapatepitotongaautōkeitepōkaiwaeainakatianatepanawhakakā.

(ii) Tuhiateingoaotetureiwhakamahiaekoeheiwhiriwhirikiheatepitotonga.

(b) Mewhakamāramakapēheatekatiitepanawhakakāewhakakāaiitemīhiniwhakaharuru.

Itōwhakautumewhakamāramaekoekaahairotoitepōkaiwaea,ā,irotohokiitepāngapanarino,itekatingaotepanawhakakā.

1pūkaha

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QUESTION THREE: RELAY SWITCHES

Acarstartermotorisoperatedbytwoseparatecircuits;thesolenoidcircuitwhichhasasmallcurrentflowingthroughit;andthestartermotorcircuitwhichhasalargecurrentflowingthroughit.Arelayswitchconsistsofasolenoidplacednearanironswitchcontact.Theironswitchcontactisusedtooperatethestartermotor.Thediagrambelowshowsthetwocircuits.

batteryignition key

starter switch

A

C D

B

starter motor

solenoidsolenoid circuit

starter motor circuit

iron switch contact

(a) (i) Onthediagramabove,labelthemagneticsouthpoleonthesolenoidwhentheignitionswitchisclosed.

(ii) Statethenameoftheruleyouusedtodeterminewherethesouthpoleislocated.

(b) Explainhowclosingtheignitionswitchturnsthestartermotoron.

Aspartofyouransweryoushouldexplainwhatoccursinthesolenoid,andintheironswitchcontact,whentheignitionswitchisclosed.

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(c) KeirarokotewāhangaABotearaiahikopōkaiwaea.

TātuhiateahungaotewhaituaautōewhakaputainaanaetewāhangaAB,irungaakemeraroitewaea,itewāerereanateiahikoirotoitearaiahikopōkaiwaea.

A B

(d) Karauahepūinewhaituaautōkia1cmmaiitewaeaheiineitekahaotewhaituaautō,eaikitewhakaaturanga.

M

A B1 cm

Magnetic field meterPūinewhaituaautō

(i) IineaetepūinewhaituaautōtetorokahaotewhaituaautōewhakaputainaanaetewāhangaABkia40μT(4.0×10–5T)itetawhitiote1.0cmmaiitewaea.

TātaihiateiahikoirotoitewāhangaABotearaiahikopōkaiwaea.

Ki te hiahia koe ki te tuhi anō i tēnei hoahoa, whakamahia te hoahoa

i te whārangi 20.

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(c) BelowissectionABofthesolenoidcircuit.

DrawthedirectionofthemagneticfieldproducedbysectionAB,bothaboveandbelowthewire,whenthecurrentisflowinginthesolenoidcircuit.

A B

(d) Amagneticfieldmeterisplaced1cmawayfromthewiretomeasurethestrengthofthemagneticfield,asshown.

M

A B1 cm

Magnetic field meter

(i) ThemagneticfieldmetermeasuredthestrengthofthemagneticfieldproducedbysectionABtobe40μT(4.0×10–5T)atadistanceof1.0cmfromthewire.

CalculatethecurrentinsectionABofsolenoidcircuit.

If you need to redraw this, use the diagram on

page 21.

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(ii) Inamahianatemīhiniwhakaharuru,karereanōheiahikomātewaeaCDkeitearaiahikootemīhiniwhakaharuru.KeirarotewaeaCDitepūinewhaituaautō,eaikitewhakaaturanga.ErereanateiahikoiCDkiteahungakōaroitōteiahikoiAB,eaikitewhakaaturangairaro.

MewhakamāramahepēheatewhakaaweateiahikoerereanaitewaeaCDkitetorokahawhaituaautōkeitewāhiiwaengaingāwaeaerua.

Metīmatamātetātuhiiteahungaongāwhaituaautōirungaakemeraroihooiawaea.

M

A B

C D

Magnetic field meterTepūinewhaituaautō

Ki te hiahia koe ki te tuhi anō i tēnei hoahoa, whakamahia te hoahoa i

te whārangi 20.

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(ii) Whenthestartermotorisoperating,currentalsoflowsthroughthewireCDinthestartermotorcircuit.ThewireCDisbelowthemagneticfieldmeter,asshown.ThecurrentinCDflowsintheoppositedirectiontothecurrentinAB,asshownbelow.

ExplainhowthecurrentthroughthewireCDaffectsthemagneticfieldstrengthintheregionbetweenthetwowires.

Startbydrawingthedirectionofthemagneticfieldsaboveandbeloweachwire.

M

A B

C D

Magnetic field meter

If you need to redraw this, use the diagram on

page 21.

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HE HOAHOA TĀPIRI

KitehiahiakoekiatuhiaanōitōhoahoamaiiteTūmahiTuatahi(a),tuhiakiraronei.Kiamāramatetohukotēheatetuhingakahiahiakoekiamākahia.

Ahanoa konganuku porowhita

Ahanoa konganuku ehara i te porowhita

KitehiahiakoekiatuhiaanōitōhoahoamaiiteTūmahiTuatoru(c),tuhiakiraronei.Kiamāramatetohukotēheatetuhingakahiahiakoekiamākahia.

A B

KitehiahiakoekiatuhiaanōitōhoahoamaiiteTūmahiTuatoru(d)(ii),tuhiakiraronei.Kiamāramatetohukotēheatetuhingakahiahiakoekiamākahia.

M

A B

C D

Magnetic field meterTepūinewhaituaautō

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SPARE DIAGRAMS

IfyouneedtoredrawyourdiagramfromQuestionOne(a),drawitbelow.Makesureitisclearwhichansweryouwantmarked.

Round metal object

Non-round metal object

IfyouneedtoredrawyourdiagramfromQuestionThree(c),drawitbelow.Makesureitisclearwhichansweryouwantmarked.

A B

IfyouneedtoredrawyourdiagramfromQuestionThree(d)(ii),drawitbelow.Makesureitisclearwhichansweryouwantmarked.

M

A B

C D

Magnetic field meter

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ANAKETAU TŪMAHI

He whārangi anō ki te hiahiatia.Tuhia te (ngā) tau tūmahi mēnā e tika ana.

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QUESTION NUMBER

Extra paper if required.Write the question number(s) if applicable.

Level 1 Physics, 201890937 Demonstrate understanding of aspects

of electricity and magnetism

2.00 p.m. Friday 23 November 2018 Credits: Four

Achievement Achievement with Merit Achievement with ExcellenceDemonstrate understanding of aspects of electricity and magnetism.

Demonstrate in-depth understanding of aspects of electricity and magnetism.

Demonstrate comprehensive understanding of aspects of electricity and magnetism.

Check that the National Student Number (NSN) on your admission slip is the same as the number at the top of this page.

You should attempt ALL the questions in this booklet.

Make sure that you have Resource Sheet L1–PHYSR.

In your answers use clear numerical working, words and / or diagrams as required.

Numerical answers should be given with an appropriate SI unit.

If you need more room for any answer, use the extra space provided at the back of this booklet and clearly number the question.

Check that this booklet has pages 2 –23 in the correct order and that none of these pages is blank.

YOU MUST HAND THIS BOOKLET TO THE SUPERVISOR AT THE END OF THE EXAMINATION.

90

93

7M

English translation of the wording on the front cover