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L 90937 NZ 1111111111111 II 1111 ~.,, SUPERVISOR'S liSE ONLY NEW ZEALAND QUALIFICATIONS AUTHORITY MANA TOHU MATAURANGA 0 AOTEAROA 2.00 pm Monday 25 November 2013 Credits: Four ' 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 L 1-PHYSR. In your answers use clear numerical working, words and/or diagrams as required. Numerical answers should be given with an appropriate Sl unit. If you need more space for any answer, use the page(s) provided at the back of this booklet and clearly number the question. Check that this booklet has pages 2-10 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. Low Excellence TOTAL © New Zealand Qualifications Authority, 2013. All rights reserved. 27 ASSESSOR'S liSE ONLY No part of this publication may be reproduced by any means without the prior permission of the New Zealand Qualifications Authority. I 2 You are advised to spend 60 minutes answering the questions in this booklet. ASSESSOR' USE ONLY QUESTION ONE: ELECTRIC STOVE TOP The diagram shows the wiring of an electric stove heating element. The element consists of two heating coils connected through a switch to a 240 V power supply, as shown in the diagram below. 240V mains supply (a) heating coil B The heating coils can be considered as two resistors connected in series with the switch and the power supply. The switch is in the off position. In the space below, use appropriate circuit symbols to complete the circuit diagram. (b) ,------- - -----1Jl 240 V mains supply Jt-------- - -, ~----~~.~3~,---------11 A t~------~ The circuit is now switched on. Explain why the same current flows through both heating coils. __\3.Lc _~_'-.;_5~-----ct2_ -cr._f/t:l.t._________;:__s__ _ __c~h.s.J~_L___~\_[Q_~-~--h.01J.L ~__rb __~_0::-t1._______ -C.:L.':I Y~ L __ VI!~~L .- q.___ . ~ {1(?(:dd_ __~··- }h~;___~v-~1?--'L__ ._ o£ L <=> vv'-'f-DbcJ,L l_(-1 _ 'i:d __~ C ~C:\l_!l_1__b_':' f JA..I£i<l ~ d\_(] l ~ no f. ~ Cv-v-re/1 ~ LJ1 {;( J Pl r ~ ~"~ ~ 1\e ) t v1 TrM\ {y e C-.,_ . c i.r c v ~ r { f lt ( br-ovy:l-,. ~J) 1 u ? (),__ ~.«r< s t;J"i71) c·r-ruv ~{ fv(/"s Jr\.«1 e:i \ Physics 90937, 2013 (Y\ 3 (c) Heating coil A has a resistance of 50 n, and heating coil B has a resistance of 40 n. ASSI:SSOR'S _'u~r:~~iky Calculate the amount of power output when the circuit is connected to a 240 V mains supply. J'·:'_f JL __.JE:._L!fJJ.__~~----'lr£¥.!!::_'1- _V-;:Z(O . u _6_ :______________ - -----~-s_zzr_ _ --------~--?-~o.-------------::_____1_ o_£]-__ _ _ _ _ _ _ _____ ----~-2-~-~'--f:-~-~--~-'2 ffi_____ $ · 1!~1 7 lt_(<z..ilfJ----------------------------------~- ( _4:__ o_.J/Jl_ _ _ _ _ _ _ _ _ _______ _ _______ ~__-z _§.:_~_6.-b__ ~ /1_ ___________________________,___ .e_::____ . ... .. ; _ __ 5-. -. A second element uses the same heating coils as the one used in the first element, but they are com1ected as shown in the diagram below. 240'V mains supply --~-: heating coil B ~:--. ~: ,-~ (d) The element is switched on. In the space below, use appropriate circuit symbols to complete the circuit diagram. I 240 V mains supply I . :·.. ---··-~- J I [5 -· A (e) I,J ·;-· State and explain how the power output of the above element differs from that in the :first element in Question One (a), when both elements are connected to a 240 V mains supply. .":·•- ·:-- !::~--~~-1t. __-~-~__ZiQ________~~ fg_ ___~__/l ;; 1z.~_ 7&,____\£~_1-JQ. ___t~__SQ _______J_F_:__;L__±L~__! 1_:{4 :;::~6 -;::L-~~ ~,;:f)i ···-------~-~-fl_____ ~-----------·------------------·--·---·------------------ ;:: t~_$__A______________________________ ··----------=l!?.~.e../1_________ _ J~-~__t __V_______J_~_j_D_:___r&JL :::_Z4aJJ_ __________\IJ}_~______b_9Jj'----~[t'dnMh___~_[§t? __ ~ :~-IQ.Lr;_'23:o_~--- _~ .. ___ - -~- "'._ _3:_/sOJI fVI "-1~I. ~SJJf121'f1 -~ ___ 2__1 ~j ~J!JL____________________ --~---c~[Qu_LL --~-0- __Ct __9~itl-~--f-~¥:_{£___Q_v}puf ~------, -so- ~;:~ ---~~~-1 ~~~{;!}l!!rt~~~-rJtfu:-~l [j •c v L-Ir f'tJ v :tv-r-llsQvd:st, I p S- u f1\:L 12~""' U<L-1 trr t--vt}- PhJ's1cs 90937, 2o13 1. .n (} cl r-(jc a--v t-v>-'~ Je;M ~ · ~\.. v povl -tr C6 ... r 4 QUESTION TWO: MAGNETIC EFFECTS (a) (i) USE:OI'IJ..l Describe what is meant by the tenn magnetic field . A"' rru-L"' . \ !l vAnL, . Ovrcv(ii) ASSESS OF 0 a&-f-d.. Ify.Pt fl1qfllfi ·~ it_~{tj~ J!:J::1 &C::fl~~;~yz;J !f}tJlJJ& Two compasses are placed near a bar magnet, as shown in tVe diagram below. Draw an arrow inside each circle to show the direction in which the compass needle will point. Physics 90937 , 2013 ()\ r. I! 5 The diagram below shows the arrangement of a magnetic catch on the wooden door of a kitchen cupboard. It consists of a magnet set in the wooden door and a piece of soft iron set in the wooden frame. ·:- I (c) soft iron in wooden frame magnet in wooden door Use the idea of induced magnetic poles to explain what takes place as the magnet in the door approaches the soft iron in the frame, and why the door is firmly held against the frame when it is shut. You may draw on the diagram to aid your explanation. lls _kk_~at8_Ji~'i -- u~c~t{ltbt:L~lj' Jik_W~t~'lf!!{f~~~~~-~Ili-.w_f~~&t~- -- u ---~~~~~~ ~ .lLV--f-L-&LL-_rn0Ln;AJ1 __ 16-_t __ ~-"<;1-+'h --BtdL ~~i.L ~La. ____ ~IVldLfi,~~~fk_- ~~.vu~~;~;lp~ft ·. CL . Jz_&-~~L_______f£wLLb-c:..q;-L<tfL_. ~- if f "L&'VI"Jrfl-7 li~ Jof2/- ~/ (d) . sw_ __~ftffl N {ltuf~)1 You are given a magnet and a metal bar. The metal bar is either a soft iron or a magnet. Physics 90937, 2013 r> , F1 I' I 6 QUESTION THREE: MORE MAGNETIC EFFECTS AS§E_SS( -- US!;! ON The diagram below shows the features of a magnetic separator used in a recycling station to extract iron from a mixture on a conveyor belt. It consists of an electromagnet with a soft iron core connected to a power supply. The arm swings above the conveyor belt and the switch is closed. The arm then swings over to a container and the switch is opened to release the material into the container. . _, swinging arm .; '. i power supply '> variable resistor (a) On the diagram below, use the letters 'N' and 'S' to label the north and the south poles of the electromagnet. (b) On the same diagram, draw the shape and the direction of the magnetic field inside the iron core. ...._ : i :I :1! ' I l ( i Physics 90937, 2013 ... 7 The cables inside the swinging arm connect the electromagnet to the power supply. When the cunent passes through the cable, a magnetic field is set up around it. ASSESSOR'S USE;Q~LY The value of k is 2.0 x I0-7 T m A- 1• swinging ann ' 15 em :' ' •x (c) The power supply is set at 150 V, and the total resistance of the circuit is 25 Q , including the variable resistor. Calculate the strength ofthe magnetic field due to the lower cable at a point 15 em away from r , it. · VI --~--~ - ~-------------~ _:__~~-6.KlO___?fmA.~i _ _ _I_~_ _zg_________~?::JSQ. _&?_?J -- ~__d_;;_j1JJ~-------~ -~~~----- --- _____-:- ~-----6:.. -t-£._________: ___________________________________-·-- --·-- ---~ f____ _________________ . . ·--- .. ? t~ to--- o6 -·---------0---b - -- -------------------------------------·---------------------------·---- ----.... . T [_dfJ__:_~_~_[_ _ _ -------- (i) -~ ~--:~;,_.:_ . .. : ;:; . __ ; ··~ Strength ____ J! (d) : . Explain why the variable resistor is included in the circuit. ~~__y fJL_c~K~2Dftu::__LL_du_d_k_slo-i! _gL _cdcW~t _(l~fr'l.-~ j- JJUeckx~.yd__ 1AL(f4_/k _2 fN~_LLL {Q:U ~- 0JL/k___df~~-fl,.._fL-~ --~------~~~E__k __c{~--f.2--. Ji~-----~<3ftd~L{~----- ---· (ii) Explain why the device would still work if the polarity of the power supply is reversed. _tL4t-fM1CJ.r}r-JL- ~l!:Jdk~ _&___dfdD.'U~td..(L -I&if _\t&_v:i_FW'tuLt_k:kL~ u-s~-----K-~____M ye.f[i_&rlrl - ~cA_ ____{____~_(~t16t'-d__fr;_a:__f!_.~_)JCQ"\ __cQERj __zr____ ·.-. ..... _- .. · _ -~Wtfh--:;L~~~~f;~-;.!!1f~ ~s ~~~~~~ , , 0 L lt-- huj L;- ( ~(\ ftvc;r e ~ 5 ('lJ ·. _ -y--- \... ~.; < E/ . 8 QUESTION FOUR: CHARGE INTERACTIONS (a) ASSESS( USE Oil When hair is combed with a plastic comb, the comb becomes negatively charged. State the type of charge on the hair, and explain why hair becomes charged this way. Jk1,._k.L"-s . bu~J< . p.Q_JCt<~it ·-&~d_PJ.t:gf.eef&.J hs.iie: . h_L.£.(\ ... '? frLf{ktA_{rrJtlt . ri:~ ...C!JCJ£l.pf&d(!ll ... Ke.-.. .L ~ t1 9Nlhj . }he .fv.~1.'r . <1 .ddhll: all d~ (b) oTJlff!:{:l?~?i;~J!/ii!J!!r~~~t~a?1~ The dtagram sliows a chlrged stnp of sticky tape hung uom a wooden shelf There are ''"' two charged rods on the wooden shelf. Rod A is positively charged, and rod B is negatively charged. •... ··rrl:e~r charged sticky tape Physics 90937, 2013 I u r. 9 (c) Some apple growers use electrostatic spraying of chemicals to protect plants from insects. In the diagram, the apple tree in the soil is earthed. The spray gun is connected to a high voltage positive supply. ,: -; ' -~ .~ ,i\I '' For copyright reasons, this image cannot be reproduced here. http://biology.phillipmartin.info/biology_apple_tree.html ASl!ESSOR'S ', U~~qijLY ·_ -.. ~~~ ::.- L 90937 _, NZ 1111111111111111111 SUPERVISOR'S USE ONLY NEW ZEALAND QUALIFICATIONS AUTHORITY MANA TOHU MATAURANGA 0 AOTEAROA 2.00 pm Monday 25 November 2013 Credits: Four ' 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 L 1-PHYSR. In your answers use clear numerical working, words and/or diagrams as required. Numerical answers should be given with an appropriate Sl unit. If you need more space for any answer, use the page(s) provided at the back of this booklet and clearly number the question. Check that this booklet has pages 2-10 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. Excellence TOTAL © New Zealand Qualifications Authority, 2013. All rights reserved. ASSESSOR'S USE ONLY No part of this publication may be reproduced by any means without the prior permission of the New Zealand Qualifications Authority. 2 You are advised to spend 60 minutes answering the questions in this booklet. --:·-5 Jl.SSESSOI'i'l .- USEON~Y '· QUESTION ONE: ELECTRIC STOVE TOP .~- The diagram shows the wiring of an electric stove heating element. The element consists of two heating coils connected through a switch to a 240 V power supply, as shown in the diagram below. .·~..:.· 240V mains supply (a) heating coil B The heating coils can be considered as two resistors connected in series with the switch and the power sppply. The switch is in the off position. ; ~-. In the space below, use appropriate circuit symbols to complete the circuit diagram. 240 V mains supply r - - - -- ---, --· (b) .; ,.. ', ..... The circuit is now switched on. _,,_' ·, Explain why the same current flows through both heating coils. ~fi~ ___ c\fi:D\tr ~ CUff\ef\t .li__-.!iley___h_.fttMe ~ro~ out- k 0Vuv il.,__.:Iha_J be.cqus~ 1~ 'J/IZ 1 gAd __ 1.t\ q OC CU.jJS~ ~lLJ2{ htJe-_iL_'fN '$ CtO.kt~ ~WI edt ~ 11M~ ~ f\e-t5 t;s+ot.sj 0 t'rt. fu fo/-q I__ri~ ~d"Ctt? {e___ Lurrent 1s eq,v v. l 1hf'o VJ ~t.9V t-i f fJ..fi. Physics 90937, 2013 -- -.- _., 3 (c) Heating coil A has a resistance of 50 .Q, and heating coil B has a resistance of 40 n. Calculate the amount of power output when the circuit is connected to a 240 V inains supply. 2.% 'Yt; ___ Y.__~_I_g_________ T_~ ____g_______________ 1 ::_____________ _5__6 ---------------~--------------------------------- _ £.:_r _::L_________E ::: - "2-40 -L4_Q ____:_____~---------- __ ---------------------------------- r : . __2 .~~~~~~A____________________ ;~~ ~ b b ~- 21f:Q________ __________________________________ p :: b40 \1\) ~ ~: ~·--- •.: .. A second element uses the same heating coils as the one used in the first element, but they are connected as shown in the diagram below. 2401./ mains supply (d) . heating coil B The element is switched on. In the space below, use appropriate circuit symbols to complete the circuit diagram . .-------,---------1: 240 V mains supply :1--- -------, _.·.· L (e) State and explain how the power output ofthe above element differs from that in the first element in Question One (a), when both elements are connected to a 240 V mains supply. _Th~--~wu ____ Q_\?.±__v~-+=-ff.__p~tliff---.J~!:t..lil.eP____ Lv~---~---~-t.t~-~JJtr_____q~-f. ___ (~Lw.e.d£r:L.. ___lh ---~~f§Jl~L ___Th_g____ ~L____~:f{1~~'f----~ __y_gl}~_--r;9~ _is_} 0.~Cf!l£~ l Clf_~l&c --~.. J,s J ca.o'l '7]; 1 lfl __l_~~cttille . --~fft_l__rgn_~f.LP.'g_f&iL{:~____ 2-::fS?JI_) _____a_(t.!l_ __fu ___ ..i!:Jli.f4nlf__~_r/_f!/(eqc{~ 6 __ .512____~ --~L~t.eDA: ____~_l:f_~___ i_fl E~~~--------------------- -------- --------- _____________________________ Physics 90937, 2013 M ..·.. -·~ 4 QUESTION TWO: MAGNETIC EFFECTS (a) (i) ASSESSOR' USE ONLY Describe what is meant by the term magnetic field . . . 6....f~~d___Lf\ ~h~-~h. .~ Ci.J(I e+I ~.E-~je-clL._~ft./l~t1{~---g __ )J{?lJ. : ..0?.~'~ ~_l{___{p[(~ __d~~-io__lN:__~_U____~!Vt a ~--"-eltied --P 6J-t:cl_, --&~.r~J:~fi_dd.£__q_l~yJ \N'ove~ ovf- o-t--- ~ lf\Or.f}.: (ii) tine.\ 11"\--:> -fi~ So·ufh '(CO/-e ,r// Two compasses are placed near a bar magnet, as shown in the diagram beloW: -po'.e Draw an arrow inside each circle to show the direction in which the compass needle will point. e . (b) . . Explain why a magnet attracts an iron nail but not a pencil lead. _;;(Qfl.l';[___q__~ «jrtl-tc __.0 e_&J__~__Iiv.J_..meaVLl .fh~_ _ d_j__!____Ji_~_(~___fu_________ 1-s. Pen()/ . f .. ____b:LJ4..1pm.c±eJ1.l?tJ---1..':1 ~ ~--~----4_le_ 4 d iL___b_Q+- __f!21q_~---·q_ - -~CJJ.~C'.L ____11~±YI!. 'at r; P fn.?re!Pre ___LL_J\ o±_~9l!ft t fr!t _ iij__~-~~b_~----------------- ____0)_~t\.__g____.M:1_Jfl.d::.__ ~_jjOil ___h_~-- 61 rlll.£D~_il~.i_fbr't]__M. _j2i.~.92._f?£_.......__ flbl\ al\~f\~ ~1"\s~\ves l s-o ~.r ~piece of-- froY\ \IY\ct ~VI-et-18€0 ~ Wi\ . < v ~v-tf-vre ti-1-\-ya c/--ut 1-v 1'Lt b-e c 6M-tj VV\'<ytt+-p- ,... ......·· ..' ~ Physics 90937, 2013 5 The diagram below shows the arrangement of a magnetic catch on the wooden door of a kitchen cupboard. It consists of a magnet set in the wooden door and a piece of soft iron set in the wooden frame. ASSES-SOR'S · u:~e6NLY ~~~ .-.::.• magnet in wooden door soft iron in wooden frame (c) Use the idea of induced magnetic poles to explain what takes place as the magnet in the door approaches the soft iron in the frame, and why the door is finnly held against the frame when it is shut. You may draw on the diagram to aid your explanation. __ pole m~ ~~ViS I0 Ol..QJ. fk l _co r:_g_!i n___~_~_g_e~__:fi_ _f~_lhcd=___fu_f_q_~,---~.Q p ::. ;_ - 3 ~~b__s--od-L>_~1 __0 t'~__fu ___ ~p{q£1,[ k[~--- f\o_r~----PDle__Qt__fl:t_J':2_cy!2~b_._____ _f\tl\J __(f1ve>el_Jh "----·-L[QJ:\_h __kfL~~€___ _mo_~lio:4Lo vt.f1_ __~4_________ gJta~JtJ1:~l____ct\Ci~±I---tl:i.m'v ---s.e:_q]LflJ-.-h_ d~rzLJ_h__v_t__ _J}_v£__ ~___fu______ _ ~-~___:furc~___of___!kt~e_fil_~~------------- ---------- ------------------------------------------- _ (d) You are given a magnet and a metal bar. The metal bar is either a soft iron or a magnet. Explain how you could find out if the metal bar is a magnet or not. Vsl~__k ____~.n~\--;jo.!L_[Qn_ fe:sf ____fl1__e____~e~!_____Q_f1!:______p_:J-------PL1cd."ff.-& _____________ ')_~-r-_h_1___f-£/~--- --C2!=.~.-tA~e:d:.J'?9..c. __pnf:-__C!_ L ifi___{~_df _____filj_~L___h:~- - ----k ___s_~v fb___~L~_.Jd____b;__ YY1CJ9Lfl£1__~_gt___&___f__(J_fYle__f~~---Lt.!__ t __ _ __ LS. ___§...___,~"'tpt___~~-ncl..;--___ _/_~~--0.)_0__l___ p~____gftrgd:~L___g_1Jf1_ i'fP_f:_il?E;__}LOf~r Lf___I l__ u______~___E-ofcJ:r~ fl d~-----~UL _ ___rz!21y._ _ k_(_ ti_fu!f_r;et!_____~P fb __t2A~-- L _ __ _g_ni____JA12f- ____fd-p~JleQ(;------------------- - ----------------------------------- - - - ----- - ------------- ------------- - - - -,.- - Physics 90937, 2013 _, 6 QUESTION THREE: MORE MAGNETIC EFFECTS ASSESSOR USE Olfl.~ The diagram below shows the features of a magnetic separator used in a recycling station to extract iron from a mixture on a conveyor belt. It consists of an electromagnet with a soft iron core connected to a power supply. The arm swings above the conveyor belt and the switch is closed. The arm then swings over to a container and the switch is opened to release the material into the container. soft iron swingmg arm power supply conveyor belt (a) variable resistor On the diagram below, use the letters 'N' and'S' to label the north and the south poles of the electromagnet. 0.. (b) On the same diagram, draw the shape and the direction ofthe magnetic field inside the iron core. Physics 90937, 2013 7 The cables inside the swinging arm connect the electromagnet to the power supply. When the current passes through the cable, a magnetic field is set up around it. ASSES.SOR'S USE,ONLY . The value ofk is 2.0 x I0-7 T m A- I_ swmgmg ann ' 15 em : ' •x (c) The power supply is set at 150 V, and the total resistance of the circuit is 25 0 , including the variable resistor. .-~ Calculate the strength of the magnetic field due to the lower cable at a point 15 em away from it. =- 1 R v 1~0~ '5:::-. 1::: Y121 "> /(_s_. _________________ r~6 L:l /\ .................- .-----····----- -----····--·_________________d________ ·-·------------ --·---·----------·-----·---------·· .....________ ~I - - --------rz.. I ~-ro ·=-:;) x ------------------------------------------·--------- ~ '1? ....., . . ; . . - - - - - - - D~.{< ~----~------- ~---~.___.--~--------;---------~·-·--------------~~~--- -----..--~------ -~---~~------------~-~~------------------- ---~ (l ' -~ -r ----·---~~~~--=------'-g____!<_j_Q_______________~~C>\_f! _____________________________________________ ---------------------·----· -------·----------------------· -a-; Q.OOODO{£ \ ________ Q~----------------------Q_______________~~---~-------.....__.________ ~----- ---------~----......·--------...,.._---~ -b Strength ·----~--~---~Q____________.l~J.i::e._______ (d) (i) Explain why the variable resistor is included in the circuit. 3 .......~~11:hJ---~~S.l~~~-(_g;t· ... J.0.1L .. Si:~ ....klb_k ___6 ,JD~k:e&L£ ..'fli.. -~--..L~~.n_k:....~O!I\IV!l_____il:e.CeJ:P.~ }_0 r£fAJ.J:,__ :ttf_~~'r!1.llJr-£.£Ls. ___fJ. e.r_qj_ __ ..... . .. g _ _ol. . .f1rt.e\ ~C-~fldD~----·.0.JI ow.Lll-J-~--~--..J&lhr___h_o_r&___J\.\-~-- ~---b_nw_1l.11~~----~~~-~k-~~1tl-~+--- -P-!.~~-J4?-fr-------------------(ii) Explain why the device would still work if the polarity ofthe power supply is reversed . .J..f _Jh.,e.______f-.e_l rALLtu--~--~----F-~L5v-f-.~1.0... .~!!. . ....0?~D_e~_ .ibt_ -~)g _ _ ~ _Q_t._~_ i:rc_BkL±t:P f0~~±- .~J~s.€Jt. _ _b?__ft!: __ml'l. v.fJo __~1.k ...~ o~J~----~±rQ.~.£ ______g____~.Q~tb. --~f:t?.k'.. Ilu1.....b.t2!Y ev!!c_(".. ____U2Y.JrA.5~:t~d\__~ 1.(:\~--~P--- J.f~_Y_\_1 .....9..L . .!.LLL _____q_b_~_cl___1-v?___~_t;fh_____J?21e~.L.. .L.... d.v~ ~· to ~lvi"UD Y\ fJ ctl hM-ef'i ;nsi'0t eat~ 1'Y\clivrd\JtJ] l Physics 90937, 2013 plect:_ o {/rl~r; » J.' 8 QUESTION FOUR: CHARGE INTERACTIONS (a) When hair is combed with a plastic comb, the comb becomes negatively charged. State the type of charge on the hair, and explain why hair becomes charged this way. ·~~- ~Cl1 r be co M~_f~I±l~-~--CL\atJ_e_rL__"1]j_cs___[J_Jecq vse.,c_ due __ri-o_fr,"~ · 1ht___ tomb ('=!b5 _!3/e_f~M____?Jf:__ihe.__ hvti[j____fVLtill~__ _jt__Ag_~_ l"v.!__~----IJtjg_t l0£. .i llt!.¥.--fh_tt!!.. .f2-0> ·;,·r-e -~"1t;i2trofl'~!!!fj~_(#-__EfJ_q(f._€:£ ..... ._fla~L!J:e.._ ~qve h. cdr less ~ nej-ttl-t'!:t _i_~9..!jfd___ lhct_~---f-Cllili'__~_Q..!.~ be.c.orv'rlf1J pes1fl~{J llvtl}~- 41/ (b) The diagram shows a charged strip of sticky tape hung from a wooden shelf. There are two charged rods on the wooden shelf. Rod A is positively charged, and rod B is negatively charged. ; wooden shelf charged sticky tape Explain how you could find out the type of charge on the tape using the rods. J _1.-\__~--~ p.~~s ___-f-osl+i~~-- c~~~;t/t~9\..?..l..~. ~-g_.J_:g.Pf!Le_i________ ~~-J---J2oI Jl. L~tef_d1 q(j..ed___ roi___/L__ _~_f~ f!(Q£__~ ___YJJ!Zf:.L_M _ Y'etf~h<e CtiSv f;j chnr,fed 7 , .. or:fe.n ly_ ~~J___f±_ __cy__ ovid 6e t:~ftr.Qslf:.!!_ b!J-_11/ o ({____B7 ___ ~_ei<LY~~---I!~ 11 ---~~4l..~.f.__g_fu::(t_c+, __];_f_ h_ hpe 0 ~~(~ 01 ctf .JJB{f.01LYJ...!y ..i..~qift~-----J.1. .. · ·- M be. ~ tdir?ltl--ed b'J .f?oJ frfifC_!_y Ch If 'Jed rod /{/ ctJ -qp~ ch"lt}~l a/tra. cf. ~ ~uv/ A qlJo ~e. /-e pelted b_y r,e J q -1 i v-e fy "i;v; ryed '(<:Y(i &.,~ becov ;,- e II' k-e c h q'if .a 'f'f-f'"' + ';f t!' . •·I I I p i: ! ·,·_. Physics 90937, 2013 ·-· 9 (c) Some apple growers use electrostatic spraying of chemicals to protect plants from insects. In the diagram, the apple tree in the soil is earthed. The spray gun is connected to a high voltage positive supply. ASSESSOR'S l,ISE ONLY positively charged spray gun I http://biology.phillipmartin.infolbiology_apple_tree.html Explain why both sides of the leaves receive spray when electrostatic spraying is used. -~--Ro~ili~~--ch~rs_e<!L. spJC{ z;--C1IQ,~J.~h ____fLf!____~_dtj____tp__ f0t ____________ -~\£yhP_bS_ft_W'!JJ. otJ...:l..~.Jf~~-~~------ Q~----P-l-g_f\_L___]:l_(J___ -~9.l:ZJ:~--- _____________ .fu.~J::R.Jz~-- Cl~.ctf~___ jp ____±:?11t_SJ~d~J. _of____k_le_q£______L~__e_tL'1XD!)____ J! sicfe; __lli_q±_ _~---~~{Iv__~_Si-L~l_f!Lc.!_j--_l!Jbg_l}_____.f.iei:-_fr:t2_s_0_f?~__~J)2_rt-:;.lJ}I- ... Ct. _fl ____ _ij:§d_,___If______f1!lt...0!e«.JJPL_>2.3.£li-r:--fZI1 .fy-..J2tJg_ ___.;__;d_e____Lfb._ l!:e§£:~.ft__b ___ _ _ _& __?.f-.l?!:.y-~tl__~....5?..LZ.Lc1_____f!._,f.[~__iprg7---s-Q__~J~-~~ Jktli.L_.IfZrq;;Yl/Jjtf!Vloree.fMct-rH.. M-€fhoct '{Jt sprqj(hj/ ~S" ~ -eldiN pk1f1+rece(re_ pmt-e,ch'Dv-..~pj;? ,'nsed-s _,.y iS (d) Cii Cqn A pair of pants and a shirt are dried in an electric tumble clothes dryer. When taken out of the dryer, the clothes stick together. ..... ·.• • :-·~ ' Using the idea of static electricity, explain why the dry clothes stick to each other after being removed from the dryer. \0_N."'i_0~_4ry£I, _::fr:::L('~~..f[Lf\J1f.& ___r-~eof~~r £[email protected]_U[trl__ ____eJ.:ecJri2LV_ _ _t?~.-~.£_[vt b_~-~---·fro~-----br~_jy~_}bcQ.____!; ~_0_¥-j "j... fu.~----~J~ (±fLc{(_fly____chM..?-£.4-r------~J~~-- __D-YJf_____tfzp'~--------- ______ ____ :J:;;;}~~::L - -F_q5 / ±1~.- ___fL0.)_-~!:q__ Q~/l]~--(J.f5f-_CJh~..,__ _l?e.fZ0..L~--- -t:?RP--qi&_ _~ 4 -(vT'>' . uhM~J-~f ___(.tfug_c±r---------th~___<;_a_u.J:._t:'J___ . fu_ ___~_q_n±L___9:..Vl_QL~J6icf..fb_ \ v·t-'rl\- +ofr-er . Wir-e~'~ ~.J Gt~ f'ffVlo~Ae d fvefV\ fNz_ dryer; ~ j ~ ~ 1 t;;;::;;;kc ~3 ~ ctre s+rrJ ef.e cfrtcq Jl~j L hc!JyecC JD (V) 6 ~) >--t-'1([ q{iyacf- [4J ~) Mvt-A- b-e(Df\1f VI\C{;IO~je0 ~-e.f) . Physics 90937, 2013 The score range for Excellence runs from 27- 32. These two Exemplars scored 27 and 29, as noted on the covers. Low Excellence l(e) Good link between higher current, same voltage and higher power supported with appropriate calculation. 2 (a) To gain merit the student needs to show the correct direction of the magnetic field- top arrow should be horizontally to the left 2 (b) To gain merit the answer needs to link the magnetisation of iron to the presence of an external field (reference to attracting electrons is incorrect) 2 (d) To gain merit in this question the student would need to recognise that soft iron would be attracted to the magnet. 3 (d)(i) to gain excellence this part needs to link the strength of the electromagnet to the size of the electric current flowing. 4 (d) This answer correctly explains charge on clothes due to excess of positive/ negative charges. It also explains why charge is retained on clothes as clothes are insulators.