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HaleyN. PHY2045 StudyUnionSpring2017 1. Analuminumnailhasanexcesschargeof3.2microcoloumbs.Howmany electronsmustbeaddedtothenailtomakeitelectricallyneutral? a. 2.0x10^13 b. 2.0x10^19 c. 3.2x10^16 d. 3.2x10^6 e. 5.0x10^-14 2. Whatisthemagnitudeanddirectionoftheelectricforceona-3.0 microcoulombchargeatapointwheretheelectricfieldis2800N/Candis directedalongthe+yaxis. a. 0.018N,-ydirection b. 0.012N,+ydirection c. 0.0084N,-ydirection d. 0.0056N,+ydirection e. 0.022N,+xdirection 3. Aparallelplatecapacitorhasapotentialdifferencebetweenitsplatesof1.6 Vandaplateseparationdifferenceof2.5mm.Whatisthemagnitudeofthe electricfieldifamaterialthathasadielectricconstantof3.4isinserted betweentheplates? a. 110V/m b. 170V/m c. 190V/m d. 240V/m e. 290V/m 4. Theeffectiveareaofeachplateofaparallelplatecapacitoris2.1m^2.The capacitorisfilledwithneoprenerubberwithadielectricconstantof6.4. Whena6.0Vpotentialdifferenceexistsacrosstheplatesofthecapacitor,the capacitorstores4.0microcoulombsofcharge.Determinetheplate separationofthecapacitor. a. 7.2x10^-5m b. 3.0x10^-4m c. 1.8x10^-4m d. 5.3x10^-4m e. 8.2x10^-5m 5. Determinethelengthofacopperwirethathasaresistanceof0.172ohms andcross-sectionalareaof7.85x10^-5m^2.Theresistivityofcopperis1.72 x10^-8ohmxm. a. 873m b. 250m c. 78.5m d. 785m e. 6570m **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 6. A220ohmresistorisconnectedacrossanacvoltagesourceV=150sin2pi60t. Whatistheaveragepowerdeliveredtothiscircuit? a. 51W b. 110W c. 280W d. 320W e. 550W 7. Anelectronismovingwithaspeedof3.5x10^5m/swhenitencountersa magneticfieldof0.6T.Thedirectionofthemagneticfieldmakesanangleof 60degreeswithrespecttothevelocityoftheelectron.Whatisthemagnitude ofthemagneticforceontheelectron? a. 4.9x10^-13N b. 3.2x10^-13N c. 1.7x10^-13N d. 3.4x10^-14N e. 2.9x10^-14N 8. Aparticlewithamassof6.64x10^-27kgandachargeof3.2x10^-19Cis acceleratedfromrestthroughapotentialdifferenceof2.45x10^6V.The particlethenentersauniform1.6Tmagneticfield.Iftheparticle’svelocityis perpendiculartothemagneticfieldatalltimes,whatisthemagnitudeofthe magneticforceexertedontheparticle? a. 0N b. 1.14x10^-10N c. 6.55x10^-10N d. 4.09x10^-11N e. 7.87x10^-12N 9. Atransformerchanges120Vacrosstheprimaryto1200Vacrossthe secondary.Ifthesecondarycoilhas800turns,howmanyturnsdoesthe primarycoilhave? a. 40 b. 80 c. 100 d. 400 e. 4000 10. A250-turnsolenoidcarriesacurrentof9.0A.Theradiusofthesolenoidis 0.075m;anditslengthis0.14m.Determinethemagneticfluxthroughthe circularcrosssectionalareaatthecenterofthesolenoid. a. 1.8x10^-5Wb b. 9.9x10^-5Wb c. 3.6x10^-4Wb d. 7.0x10^-4Wb e. 2.2x10^-3Wb **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 11. Two3.25microfaradcapacitorsareconnectedinseriesacrosstheterminals ofa50Hzacgeneratorthathasapeakvoltageof244.Determinetherms currentinthecircuit. a. 0.917A b. 0.802A c. 0.308A d. 0.621A e. 0.125A 12. Whichoneofthefollowinggraphsshowshowinductivereactancevaries withfrequency? a. A b. B c. C d. D e. E 13. AseriesRCLcircuitoperatingat60Hzcontainsa49ohmresistoranda5.0 microfaradcapacitor.Ifthepowerfactorofthecircuitis+1.00,whatisthe inductanceoftheinductorinthiscircuit? a. 0.86H b. 1.4H c. 2.3H d. 57H e. 320H 14. Electromagneticwavesareradiateduniformlyinalldirectionsfromasource. Thermselectricfieldofthewavesismeasured35kmfromthesourceto haveanrmsvalueof0.012N/C.Determinetheaveragetotalpowerradiated bythesource a. 5.9x10^3W b. 9.0x10^3W c. 2.4x10^4W d. 6.3x10^4W e. 1.6x10^5W 15. Anelectromagneticwavehasanelectricfieldwithapeakvalueof250N/C. Whatistheaverageintensityofthewave? a. 0.66W/m^2 b. 0.89W/m^2 c. 83W/m^2 d. 120W/m^2 **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 e. 170W/m^2 16. Awomanstands2.0minfrontofaconvexmirrorandnoticesthatherimage heightis¼ofheractualheight.Determinetheradiusofcurvatureofthe mirror. a. 0.67m b. 1.3m c. 2.0m d. 4.0m e. 6.0m 17. Anobjectisplaced20cminfrontofaconcavesphericalmirrorthathasa radiusofcurvatureof60cm.Whichofthefollowingistrue? a. Theimageisvirtualandlocatedatinfinity b. Theimageisrealandlocated60cmfromthemirror c. Theimageisrealandlocated120cmfromthemirror d. Theimageisvirtualandlocated60cmfromthemirror e. Theimageisvirtualandlocated120cmfromthemirror 18. Achargedparticleislaunchedwithavelocityof5.2x10^4m/satanangleof 35degreeswithrespecttoa0.0045Tmagneticfield.Ifthemagneticfield exertsaforceof0.0026Nontheparticle,determinethemagnitudeofthe chargeontheparticle. a. 11microcoulombs b. 15microcoulombs c. 19microcoulombs d. 23microcoulombs e. 27microcoulombs 19. A4-Acurrentismaintainedinasimplecircuitwithatotalresistanceof2 ohms.Howmuchenergyisdeliveredin45seconds? a. 1440J b. 96J c. 360J d. 720J e. 240J 20. A-4.0microcoulombchargeislocated0.45mtotheleftofa+6.0 microcoulombcharge.Whatisthemagnitudeanddirectionofthe electrostaticforceonthepositivecharge? a. 2.2Ntotheright b. 2.2Ntotheleft c. 1.1Ntotheright d. 1.1Ntotheleft e. 4.4Ntotheright **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 FreeResponse 1. Adiskwithradius0.1misorientedwithitsaxisatanangleof30degreesto auniformelectricfieldwithmagnitudeof2.0x10^3N/C.a)Whatisthetotal electricfluxthroughthedisk?b)Whatisthetotalfluxthroughthediskifitis turnedsothatitsplaneisparalleltoE?c)Whatisthetotalfluxthroughthe diskifitisturnedsothatitsaxisisparalleltoE? 2. Apositivepointcharge(+7.2x10^8C)issurroundedbyanequipotential surfaceA,whichhasaradiusrAof1.8m.Apositivetestcharge(+4.5x10^11C)movesfromsurfaceAtoanotherequipotentialsurfaceB,whichhasa radiusrB.TheworkdoneasthetestchargemovesfromsurfaceAtosurface BisWab=-8.1x10^-9J.FindrB. **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 3. Findtheequivalentresistance. **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 4. Whenachargedparticlemovesatanangleof25degreeswithrespecttoa magneticfielditexperiencesamagneticforceF.Atwhatanglelessthan90 degreeswithrespecttothisfieldwillthisparticle,movingatthesamespeed, experienceamagneticforceof2F? 5. A120Vmotordrawsacurrentof7Awhenrunningatnormalspeed.The resistanceofthearmaturewireis0.27ohms.a)Determinethebackemf generatedbythemotor.b)Whatisthecurrentattheinstantwhenthemotor isjustturnedonandhasnotbeguntorotate?c)Whatseriesresistancemust beaddedtolimitthestartingcurrentto15A? **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 6. Inaseriescircuit,agenerator(1350Hz,15V)isconnectedacrossa16ohm resistor,a4.1microfaradcapacitor,anda5.3mHinductor.Findthevoltage acrosstheinductor. 7. Theaverageintensityofsunlightatthetopoftheearth’satmosphereis1390 W/m^2.Whatisthemaximumenergythata25mby45msolarpanelcould collectinonehourinthissunlight? **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems** HaleyN. PHY2045 StudyUnionSpring2017 8. Amirrorproducesanimagethatislocated34cmbehindthemirrorwhen theobjectislocated7.5cminfrontofthemirror.Whatisthefocallengthof themirror,andisthemirrorconcaveorconvex? 9. Thedrawingshowsarectangularblockofglass(n=1.52)surroundedby liquidcarbondisulfide(n=1.63).Arayoflightisincidentontheglassatpoint Awitha30degreeangleofincidence.Atwhatangleofrefractiondoesthe rayleavetheglassatpointB? **QuestionsadaptedfromDr.Khondaker’sandDr.Saha’spracticeproblems**