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StaticElectricityandMagnetismReviewfortheTestANSWERKEY2015.notebook

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November20,2015

aufbau

Hund'sRule

Pauliexclusionprinciple

Didyouremember:

http://chemwiki.ucdavis.edu/Physical_Chemistry/Quantum_Mechanics/Quantum_Theory/Trapped_Particles/Atoms/Electron_Configuration

http://www.kentchemistry.com/links/AtomicStructure/PauliHundsRule.htm

https://www.youtube.com/watch?v=LJsP0ihzbw

https://www.youtube.com/watch?v=eTMtRh8AIs

http://chemwiki.ucdavis.edu/Physical_Chemistry/Quantum_Mechanics/Quantum_Theory/Trapped_Particles/Atoms/Electron_Configurationhttp://www.kentchemistry.com/links/AtomicStructure/PauliHundsRule.htmhttps://www.youtube.com/watch?v=LJ-sP0ihzbwhttps://www.youtube.com/watch?v=e-TMtRh8AIs


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ElectricityQuestions:1. Whatisthedifferencebetweenaninsulatorandaconductor?

Provide2examplesofeach.

2. Inanatom,wherewouldyoufindeachofthese:

3. Aneutralobjectbecomes________________chargedifelectronsareremoved.

4. Twoobjectshavecollectedstaticelectricitywiththesamecharge.Whatwouldtheobjectsdowhenplacedneareachother?

5. Whatdoesitmeanwhenwesayanatomisneutral?

a.protons b.neutrons c.electronsnucleus nucleus cloud

positively

Insulator:electronsdonotmovefreely

Conductorelectronscanmovefreely,permitotherelectronstomovethrough

rubber,plastic,dryair,glass

mostmetals,skin,wet/humidair

theywouldrepeleachother

ithasanequalnumberofprotons(+)andelectrons()


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6.Iftheoverallnetchargeisthesumofallchargesonanobject,whatisthesignificanceofanoverallnetchargethatisnegative?

7.Howisastaticchargecreated?

8.WhatisaCoulomb?

9.Whatdoesanelectroscopeindicate?

10.Howcanyouuseanelectroscopetodeterminethechargeofanunknownobject?

Therearemoreeontheobjectthanprotons.

frictiontheunitforcharges

presenceofcharge

bringtheobjectclosetotheelectroscope:ifitisneutral,theelectroscopewillnotchange.

ifithasacharge,youcanbringinanobjectwhosechargeisknown.ifthatobjectandtheunknownattract,theyareopposite,otherwisetheyaresimilar(samecharge).


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11.Explainhowastaticchargeisgenerated.Whatarethecharacteristicsofastaticcharge?

12.Usediagramstoillustratetheelectricfieldaroundthefollowing:

a(+)charge a()charge (+)chargetwiceasstrong asthefirstcharge.

excessofelectronsbuildsuponanobject.Oftenaresultoffriction.

+

+


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13.Brieflyexplainchargeseparation(outlinethebasicsteps).

14.Brieflyexplainchargingbyconduction(outlinethebasicsteps).

1)arodwith()chargeisbroughtnearaneutralelectroscope.

2)Electronslocatedatthetopoftheelectroscopewillberepelledfromtheincomingrod.Theywillflowdownintotheleaves,thefarthestplacefromthe()source.3)Theleavesnowhaveexcesselectrons,andoverall()charge.

4)Theleaveswill repeleachother.

1)A()rodisbroughttoaneutralelectroscope.2)Astherodapproaches,eontheelectroscopearerepelledtowardtheleaves.Thisleavesthetopwithanoverall(+)charge.3)The()rodmakescontactwiththeheadandtransferse.4)Whentherodisremoved,theelectroscopehasanoverall()charge.


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15.Brieflyexplainchargingbyinduction(outlinethebasicsteps).

16.Whatisacapacitor?Brieflyexplainthestructureandfunction.

17.Whatdowemeanbythetermgrounding.Whattypesofobjectscanprovidethis?

deviceusedtostorecharge.Maybeusedtodrain"excess"chargefromanobject.

providesapathwayforchargestoreachEarthsurface.people,metalrods,trees

Example:1)Startslikechargeseparation.2)Whilethe()rodispresent,anobjecttouchestheelectroscopeandthe"excess"earedrained.3)Whentherodistakenaway,theelectroscopeisleftwithanoverall(+)charge.


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18.Whatistheultimatedestinationofchargesthatarebeinggrounded?

19.Provideanillustrationdemonstratinghowchargedparticlesaredistributeda)onaneutralobject.

b)onanobjectthathasexperiencedchargeseparation.

Earth!

++ ++

+ +

+ +++

+

+


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20.BeabletouseCoulombsLawtosolveproblems.

a)Apointchargeof+2.0Cislocated0.15mfromasecondpointchargeof4.0C.Whatisthemagnitudeanddirectionoftheforceoneachcharge?

=2.0x106

attractive

meters


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b)Twochargesofequalmagnitudeexertanattractiveforceof4.0x104Noneachother.Ifthemagnitudeofeachchargeis2.0C,howfarapartarethecharges?

8.99x109x(2.0x106)x(2.0x106)4.0x104

r2=

r=9.48metersr2=89.9


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21.Whatistheelectricforce?

22.Whatfactorswillaffecttheforcebetween2charges?

23.Explaintheprocessbywhichlightningiscreated.

theinfluenceachargehasonitssurroundings.

strengthofthecharge,whethertheyaresameoroppositecharges,distancebetweenthecharges.

tallthunderstormsicecrystalsform asicefalls,collisionsoccur Collisionselectronsreleasedfromthecrystalscloud

becomes() Excess()incloudforces()awayontheground Lightning=dischargeofexcess()totheground


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November20,2015

MagnetismQuestions:24.Whatisamagnet?

25.Whyisanelectronsspinsignificant?

26.Whatisadomain?

27.Whatistrueaboutthedomainsinapermanentmagnet?

28.Whatisthearrangementofdomainsinanonmagneticsubstance?

regionwhereallelectronsarespinninginthesamedirection.

spinningelectronthatisnot"cancelled"byanoppositespinwillcreateamagneticfield.

theyareallorientedinthesamedirection

random!

objectthateithercontainspairedethatspininthesamedirectionor asingle electron thatspins


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29.Explaintheimportanceofvalenceelectronconfigurationindeterminingwhetherasubstancewillbemagnetic.

30.Explainhowapermanentmagnetcouldbedemagnetized(>1example).

31.Inamagnet____________poleswillattract,and______________poleswillrepel.

opposite similar

heatitup(excessiveheat),strike/dropit

dorforbitals unpairedelectrons


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32.SketchtwoNorthmagnetendsthatarerepelling.HINT:Whatshouldthefieldlineslooklike?

33.WhattypeofmagnetistheEarth?

34.Accordingtothemostrecentresearch,howisthemagneticfieldoftheEarthformed?

electromagnet

http://esamultimedia.esa.int/multimedia/edu/PlanetaryMagneticFields.swf

http://esamultimedia.esa.int/multimedia/edu/PlanetaryMagneticFields.swf


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ThisanimationshowsacrosssectionofEarthitillustratesamathematicalmodelofhowconvectionmightoccurinthemantle.

Inthemodel,redrepresentsheatedmaterialsthatarelessdensethantheirsurroundings.Darkbluerepresentscoolermaterialsthataredenserthantheirsurroundings.


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35.Drawandlabelapermanentbarmagnetwithmagneticfieldlinesintheproperdirection.

36.Whatismagneticflux?Howdoesitrelatetothemagneticfieldandthemagneticforce?

37.Whatisformedwhenyouruncurrentthroughawire?

38Usingthefirstrighthandrule,ahandgrippingawirewithcurrentflowingindicatescurrentwiththe___________andindicatesthedirectionofthemagneticfieldwiththe__________.

S N

#offieldlinesinanareaItisanindicationoffieldstrength

thumbfingers

anelectromagnet


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39.Whatisanelectromagnet?

40.Whatisasolenoid?

41.Whathappenswhenthedirectionofcurrentinasolenoidisreversed?

42.Howdoesthenumberofcoilsinanelectromagnetaffectitsstrength? Whatotherfactorscouldyouchangetoalterthestrength?

atemporarymagnet needsanelectriccurrent

wireswrappedaroundametalcore

polesofthemagnetarereversed

Attachments

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