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Danyal Education Magnetism Assignment 4 (Pure) Unit U 3. A Aluminium C Gold A C B D Copper Cobalt Steel C D andZ only B 1 and 3 only D 1,2 and 3 attracts to an iron. points to the north. repels the S-pole of a magnet. attracts the S-pole of a ( ) 1. repel each other because the unknown pole is a N-pole. 2. repel each other because the unknown pole is a S-pole. 3. attract each other because the unknown pole is a S-pole. () Which statement(s) is/are correct? A lonly C land3only magnet. ( ) ny A attracts all metal B attracts another magnet. Da The compass needle is a magnet wrth the pointer as the south seeking pole. C The compass needle rs a magnet with the pointer as the north seeking pole. The compass needle is an electromagnet that is charged by rubbing when the needle is ) () turning. ( \\, 0 12. When one end of a magnet is placed near a compass, the The needle of a plotting compass is made of pointer (N pole) of the compass turns and points at the steel D tungsten ( When a bar magnet is suspended freely, B D C attracts a piece of iron. D repels a compass needle. B ) u 11. Why does a compass needle always point to the north? A The compass needle is made of a magnetic material. A metal bar is confirmed to be a magnet when it A copper C iron B 2only D 2and3only ( IV al B C D there will be attraction between the two p0les. there will be repulsion between the two poles. pole of another magnet, the two magnets 2and3 only 1 When the N-pole of a magnet is placed near the S-pole of another magnet, A the N-pole will be attracted to the S-pole. B the S-pole will be attracted to the N-pole. () To locate the S-pole of a compass, find the end of the compass A d 7. g\\, 9. ( U 10. When the S-pole of a magnet is placed near an unknown Copper Nickel needle that d 6. ) Which of the following is a magnetic material? 1 d 5. ( Which of the following is a magnetic materral? 2. 3. d 4. Plastic D N/etal poles of the magnet. at io d 2. B A B ends of the magnet. C centre of the magnet. D one-quarter distance from the poles of the magnet. Which of the following group of materials is possible to ftnd magnetic material? A Wood C Ceramic A magnet is strongest near the Ed uc d, d B. 167 :.1;.:;1.;::t,:1.iy.:t n For each of the questions, there are four possible choices. Choose the one you consider correct and record your choice. 19 I -. magnet because ) A the pointer points at any end of a magnet. B the end near the compass is a N-pole. C D A it will point to the north-south direction. B it will point to the east-west direction. the end near the compass is a S-pole. a magnet always attracts the pointer of a compass. ) C it will not point to a ixed direction. D either end of the bar magnet will point to the north. f ( Theme 5 I El*r:tricitv *n* &lofinetisn'l M 0 13. When one end of an iron rod is placed near a compass, A the N-pole of the compass needle always point towards g\\, 19. A magnet is placed near an iron rod as shown. What is the magnetic pole induced at X? What is the name of the process? it. B the S-pole of the compass needle always point towards C D it. any pole of the compass needle may point towards it. the compass needle will not be affected by the iron rod. iron rod x () A B g\, 14. Which of the following does not usually use a permanent magnet? A C plotting electric C D compass B motor bell D ammeter ( M M CI () M 0 16. What is the reason to prvot the compass needle on a sharp A To mrnimise the magnetrc effect on the pin. B To maximise the magnetic effect on the pin. C To minimise the To ensure that the compass needle the prvoted point. will not drop ( Da ny al this process? ,l u ( \V bar. The N-pole of the magnet is close t0 the centre Y of the steel bar as shown. What are the poles induced in the steel bar at X, Y and Z? ) x AA magnet attracts an iron rod. BA magnet attracts another magnet. CA magnet repels another magnet. DA compass needle points to the magnetic north pole of {) () 0 21. Ihe diagram shows a magnet being used to pick up a steel Which of the following is an example of magnetic inductron? th e Earth. Bepels to the right B Attracts to the left C Falls off from the magnet D Remains stationary ) magnetic material becomes a magnet. What is the name of A electromagnetic rnductlon B electrostaticinduction C magnetic induction D electromagnetism A from d 17. When a magnet is placed near a magnetic matelal, the d s friction between the pin and the compass need le. D The diagram below shows a magnet attracting three steel pins while another magnet is approachrng slowly from the left. What will happen to the string of attracted pins? Ed pi n? 20. () nduction uc at C D S-pole S-pole i a magnet? Find out if the material is a metal or a non-metal. Find out if the material is a conductor or a non-conductor. Find 0ut if the material can be attracted t0 a steel plate. Find out if the material can be repelled by a compass. Name of process magnetic induction electromagnetic induction magnetic induction electromagnetic N-pole N-pole ) 0 15. What should a student do to find out whether a material is A B N/agnetic pole at X ion 168 Pole X NNN NSN SNS SSS induced at A B C D Y Pole Y induced at Z Pole induced at Z () UnitlgI'' ,..',.:169 t\, s 22. Ihe diagram shows a magnet being used to pick up a steel v 25. Which of the following are possible sets of polarity when magnetising a steel bar by the stroking method? bar. The N-pole of the magnet is close to the centre Y of the steel bar as shown. What are the poles induced in the steel bar at X, Y andZ? magnet a direction of stroke x Y steel bar Z Y 4. P=N,O=S,X=N,Y=S P=N,O=S,X=S,Y=N P=S,O=N,X=S,Y=N P=S,O=N,X=N,Y=S A 1 and 2 only C 1 and 3 only 1. A B C D Pole Y Pole induced at induced at Z () at io Pole X NNN NSN SNS SSS induced at 2. 2 n X W 26. What can B3 an d 4 0n ly D2 an d 4 0n ly () be deduced from the following diagram showing a current flowing in a straight wire surrounded by four U 23. Which of the following are possible t2 direction of stroke direction of stroke l / comPasses? Ed uc results when a steel bar is being magnetised by the stroking method? l -.......) ---).---N A S steel bar direction of stroke al f C D 123 direction of stroke / land3only 1,2and3 D v 27. () o o The magnetic field caused by the four compasses put close together will always cause the compass needles to point in a circle. Compass needles are affected by the material of the wire. Compass needles are affected by the circular electric field in the wire. Compass needles are affected by the circular magnetic field produced by the current in the ) wire. ( Plotting compasses X and Y are placed below and on top of a current carryi":J:::'J,::l::'' u"no*,.in Which of the following is/are possible result(s)when a steel bar is being magnetised by the double stroking method? Da v 24. B l and2only 2and3only ny A C I 3 { B current direction N S steel bar A C direction of X stroke direction of stroke Y N S steel bar 2 only B 1 and 2and3only D 1 and 2o nly 3o nly ( ) the diagram 17O Therne 5 I tieciricity r:nd b.4*Ene,,isr: Which of the following shows the possible correct directions of the compass needles? A current direction $ curuent direction X X Y Y d 30. lron core is placed in a current carrying coil to A demagnetise the solenoid. B create a changing magnetic field. C increase the magnetic strength around the solenoid D increase the current f lowing in the solenoid. ( gM 31. Which of the followrng two materials are used for the core and coil of an electromagnet? ! current direction core iron iron lVlaterial for current direction A B Y D M Y CI 32. A iron B iron C steel D steel current direction x Y Property U rr. *n,rlr direction x B 6l permanent demagnetised magnet electromagnet of easily magnetised easily demagnetised current direction 6l ! C Da B D no core ffi tl copper core D lron core rvooden core () U ro. *n,rn iron ceramic of the following is the strongest electromagnet? A B core core () D C electromagnet is steel copper B t The most suitable material to be used as the core of an A () magnet current direction 6lo 6lo drn permanent thefollowing producesthe strongestelectromagnet? C x ny f, current direction al current ) magnetised easily A Which of the following shows the possible correct directions of the compass needles? A ( Usage electromagnet easily Ed uc Plotting compasses X and Y are placed on the right and on the left 0f a current carrying wire respectively as shown in the diagram tr0n Which of the following is correct? lvlaterial () v 28. steel steel C X copper iron c0pper at io x lVaterial for coil n f, () core core () | Unit 19 g\\, 35. ln which diagram(s) is/are the correct poles for the t1:,r,;1 17 1 X along the path shown. The final position of the compass needle is shown. t2 N ,1: gM 40. A plotting compass is moved slowly towards the metal bar electromagnet indicated? I :'t:,, 1. 1,; N S core s bar X N core 3 What can you conclude about bar X based 0n the diagram S above? steel core t A C 2o nly 2a nd 3 0n ly B l and2only D 1,2 and 3 ion A Bar X is a magnetic material. B Bar X is a magnet. C D () \\, W 36. What A B C D field produced throughout the wire to flow through the core of the solenoid. To reduce the space taken up by the long wire. To ensure that the magnetic field strength is constant. To reduce the amount of wires used to produce the same magnetic field strength as a straight ) To concentrate the magnetic 0 41. A plotting compass is moved slowly towards the metal bar along the path shown. The final position of the compass needle is shown. bar X @... electromagnet for a given flow of current? C D () wire. ( w 37. Which coil produces the strongest A B a Bar X is a either a magnet or a magnetic material. Ed uc at is the main reason for using a solenoid instead of straight wire to produce magnetic field? Bar X is a non-magnetic material. A 10 cm coil with 100 turns A 5 cm coil with 200 turns A 10 cm coil with 200 turns A 20 cm coil with 200 N What can you conclude about bar X based on the diagram above? turns ( ) A B Bar X is a magnetic material. Bar X is a magnet. C Bar X is a non-magnetic material. D Bar X is a either a magnet or a magnetic material. () Da ny al U 38. Which of the following diagrams shows the correct magnetic field pattern between the poles of two bar magnets? A C --@,- D N +L tk S below. S D /itr( /rr1 ( v 39. ) Which diagram below indicates the correct magnetic field pattern between the poles oJ two bar magnets? A /i\ SGS B -=--Y7C g\\, 42. A plotting compass is placed beside a bar magnet as shown -+q-l)\r11- N N S S D () Which of the drawings shows the correct direction of the compass needle? ABCD c c () 172 Theme 5 I Electricity ond Mognetism M 0 43. A compass is placed near a copper bar as shown in the N 41 . compass Ihe diagram below shows the magnetic field of two magnets placed close together. Three plotting compasses are placed at the Iocations shown. diagram. ln which direction will the c0mpass needle point? N ti copper bar t+) G D C @ @ A compass is placed between () Which is the set of compasses showing the correct directions of the needles? two magnets of equal magnetic 123 strength as shown in the diagram. ln which direction willthe compass needle point? AO BO CO compass N S A B C O O O DO O N S ion B D v 48. t O O E e at U 44 A ( ) The diagram shows the magnetic field of two magnets placed Ed uc close together wrth three plotting compasses placed at the locations shown. \V 0 +S n magnet is hanging freely rn the directron as shown. a A magnetic field as strong as the Earths magnetic field is Which is the set of compasses showing the correct directions of needles? introduced from the side as shown. magnetic field al z / ny a 123 Ae o BO o e o O ce Do e o o ( ) What may be the final position of the magnet? ABCD Da v 46. A nt\ N 49. The diagram below shows the magnetic field of two current carrying wires going into the plane of the paper. () compass is placed between two magnets as shown in the diagram. N/agnet X is stronger than magnet Y ln which direction will the compass needle point? magnet N compass X S A o BC magnet Y N S D Which set of compasses shows the correct directions of the needles? 123 Ao o BO O o O cc o Do o o o ( ) Unit v 50. The diagram below shows the magnetic field of two current carrying wires perpendicular to the plane of the paper. v 53. l9 I './....1, :)1 ,,.::,:,:.t1, 173 A steel rod and an iron rod are placed inside a solenoid which is connected t0 a strong d.c. supply. steel iron rl side view front view drawing not to scale Which of the following shows the side view of the rods when the circuit is switched on for a while before switching it off needles? aga in? AO BO co DO O O o O A O O o uc at io 123 n Which set of compasses shows the correct directions of the on ! O off again C g\V 51. Four magnetic materials are used to pick up paper clips on B on offagain on off again D off again after they were taken out from a coil which is connected to a strong direct current. The numbers of paper clips picked up by the four magnetic v 54. Two steel rods are placed inside a solenoid which lVagnetic material 2 Ed materials are listed below: ( lVagnetic material 3 10 ) is connected to a strong d.c. supply. Numher of paper clips picked up I IVagnetic material side view al 20 v 52. an aga in? ( 4 steel D N ()n off again on off again D on off again ( S Steel bar retains its magnetism and iron bar loses its magnetism. lron bar retains its magnetism and steel bar loses its magnetism. off again C A The steel and iron bars repel each other. B Both steel and iron bars lose their magnetism. C B on ) A light steel bar and a light iron bar are attracted to a magnet as shown. What will possibly happen when the magnet is removed? iron Which of thefollowing showsthe sideviewof the rodswhen the circuit is switched on for a while before switchinq it off A material 1 material 2 material 3 material Da C D ny electromagnet? front view drawing not to scale Which is the best magnetic material to be used as magnetic magnetic magnetic magnetic -lrl 5 lVagnetic material 4 A B steel rods 0 1 ( ) Theme 5 I Electriciiy ond Alognetism v 59. EXTENSION QUESTIONS IV A magnet is facing the east-west position? B C The magnetic field in the east-west direction is weaker than the magnetic field in the north-south direction. The magnetic field in the east-west direction is stronger than the magnetic field in the north-south directton. The weak magnetic f ield of the Earth in the north-south direction can only align the magnetic domains over country to country are found to be magnetised. Which of the following cases has the strongest magnetic strength? v 57. A km km km 40 km Earth Earth D ( magnet. 20 20 40 N C gM 56. Some steel pipelines which are used to transport petrol from A B C D N a short distance (width of bar magnet). There is no magnetic field in the east-west direction to magnetise the bar ) Distance B Ed uc at io D Which of the following shows the correct direction of the magnet? 0 SS. Why is demagnetisation of bar magnet best done when the A A magnet is suspended freely at the north pole of the Earth. n 174 0rientation north-south east-west north-south ( east-west v 60. ) N N Earth Earth The diagram below shows the circuit of an electric bell. What happens when the bell button is pressed (switched on) and released (switched off)? magnet ls inserted into the centre of a coil and an e.m.f. is induced across the coil. The magnitude of the induced current depends on springy metal 1 the diameter of the coil. 2 the strength of a magnet. 3 the thickness of the wire of which the coil is made. B 2and3only A land2only D 1,2and3 ( C land3only strip soft iron hammer ) gong P and 0 attract four soft iron bars, F, G, H and I at their poles as shown below. What will happen to the iron bars when the two magnets move towards each other and attract each other? ny PQ S S F A 1 ting is heard B 1 ting is heard C continuous ringing silence D G F Switch off silence 1 ting is heard silence continuous ringing () N V U1. ,n. diagram shows a bar magnet N in a magnetic field S G A Nothing will happen. B G and H will drop off. C D gong 2 Switch on al Two magnets Da W 58. () and H will repel away each other. and I will attract G and H respectively. lllllllll () What will happen to the bar magnet? A The bar magnet does not react to the magnetic field. B The bar magnet moves in the directi0n 0f the field. C D The bar magnet moves in the opposite direction of the field. The bar magnet rotates clockwise by ) 90'. ( Unit \V 0 62. Which of the following observations confirms that an object . : '''.,: t',':.: 175 l9 | v 66. A current-carrying wire is coiled around an iron horseshoe as shown. What are the polarities of X and Y? is a magnet? A The object is attracted by a strong bar magnet. B The object causes a compass needle to move. The object rotates before being attracted to a bar magnet. The object is attracted to both poles of a horseshoe ( magnet. ) X U 63. A bar magnet is broken as shown below. What are the polarities at X and Y? AtX A N-pole B S-pole x YS N ,, C D N-pole S-pole N-pole S-pole N-pole N-pole S-pole S-pole W 67. () / Figure I Figure 2 Bar X Bar Y steel bar steel bar iron bar () A light bar magnet is suspended near a current- carrying wire as shown below. What will happen to the light bar magnet? bar magnet steel bar bar magnet () Two long iron pins are placed at the ends of a bar magnet as shown. Da I () the needle points in the direction shown. al bar magnet bar magnet Alt will rotate clockwise. Blt wi I rotate anti-clockwise. Clt willmove to the right. Dlt will move to the left. g\\, 68. When a plotting compass is placed near an electromagnet, ny A B C D v 65. S-pole Two identical metal bars X and Y are positioned in the two diagrams shown below. lf there is a strong attraction in Figure 1 and weak attraction in Figure 2, what are the possible materials for X and Y? Ed v 64. Polaritv at Y S-pole S-pole N-pole uc A B C D Polaritv at X N-pole AtY N-pole at io broken line Y n C D N @ S long iron pins Which of the following diagrams, A, B, C or D shows the Which of the following shows the direction of the needle situati0n when a shorter magnet is used? A C NS NS B when the polarities of the battery is being reversed? NS ABCD @ @ @ @ D NS () () 176 lheme 5 I Electricity ond Mcgnetisrn g\\, 69. When a plotting compass is placed near an electromagnet, W 13. the needle points in the direction shown. c Equal amount of current is flowing in two insulated wires perpendicular to each other as shown. Which segment, A. B, C or D has the strongest magnetic field flowing out of the paper? A B C n () Which of the f0llowing shows the direction of the needle when the variable resistance is being decreased? U 74. N/agnetic shield is used to protect some equipment from magnetic field. Which of the foll0wing is the best material for magnetic shield? Ed uc at io ABCD @C@A() M 0 70. Which of the following is the best way to demagnetise magnet using the heating method? A plastic C iron D M in the air by the attraction force from a magnet and the gravitational force as shown in the set-up. ( tr A B C D [+$ +$ +! +[ Which process below can magnetise a steel bar? 1. 2. 3. Stroke the steel bar with a magnet. lnsert the steel bar in a coilwhich is connected to an alternating current. lnsertthe steel bar in a coilwhich is connected to a direct current. A land2only C 2and3only B land3only D 1,2and3 ( Four different sheets of material are inserted in turn between the magnet and the paper clip. Which one will cause the paper clip to drop? 1. steel 3. copper Da W 72. I +l+ 3-1-4 2-1-4 1*3-5 al 4. string taped to the base of the retort stand lnsert the magnetised steel bar into a solenoid Connect direct current to a solenoid. Connect alternating current t0 a solenoid. Pull the steel bar slowly out of the solenoid. Switch off the current supply. ny J. ---->: thin, light string demagnetrse a steel bar using the electrical method? 2. sheet of material paper clip w 71 Which of the following is the correct sequence to effectively 1. ) 0 75. A paper clip is held stationary the east-west direction. Heat the magnet to become red hot and allow it to cool in the north-south direction. Heat the magnet to become red hot and allow it to cool in the east-west ) direction. ( a A Heat the magnet in boiling water and allow it to cool in the north-south direction. B Heat the magnet in boiling water and allow it t0 cool in C B steel D copper ) A 3 only B 4 only C l and2only D 1,2 and 3 only 2. 4. iron plastic ( )