Download PHY 2054 Haley N.

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**