apphysicsbelectrostaticsreviewap物理b静电学评论

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1、APPhysicsBElectrostaticsReviewname___________________1.Describethesimilaritiesanddifferencesbetweenthelawsofgravity(Newton'sUniversalGravitation)andCoulomb'slawofelectrostaticforce.(writeequations)2.StateFOURwaysanobjectcanbechargedandexplaineach.3.Whenacomb

2、attractsatinypieceofpapersometimesonepiecejumpsawayfromthecomb.Explainwhy.4.DrawtheelectricfieldlinessurroundingtwoNEGATIVEchargesadistancedapart.5.Findthemagnitudeanddirectionoftheforcebetweentwochargesof1.5nanocoulombs(1nc=1x10-9C)onemillimeterapart.5a.Wha

3、twouldhappentothisforceifthechargesweretripledandthedistancebwtweenthenwerereducedtotwothirdsitsoriginalvalue?6.WhatisthenetforceonanUNCHARGEDinsulatingsphereinaUNIFORMelectricfield?61.WhatisthenetforceonanUNCHARGEDconductingsphereinaUNIFORMelectricfield?2.T

4、woparallelconductingplatesareconnectedtoavoltagesource.Whathappenstothemagnitudeoftheelectricfieldifthevoltageisdoubledandthedistancebetweentheplatesisreducedbyhalf?3.Asmallconductingsphereholdscharge+Q.Anothersphereholdingcharge-5QisRcentimetersawayfromthef

5、irstsphere.Theforcebetweenthechargesis25Newtons.Thechargesarebrieflybroughtintocontactandthenreturnedtotheiroriginalpositions.Whatistheforcebetweenthechargesnow?Hasitsdirectionchanged?4.Whatistrueabouttheelectricfieldinsideaconductor?Why?5.Whatistrueaboutthe

6、directionofanelectricfieldjustoutsideaconductor?6.Acharge-Qisplacedatthecenterofasphericalconductingshell.Drawthepatternofelectricfieldlines.7.Twoverylargeparallelmetalplates5cmapartareoppositelychargedwithapotentialdifferenceof10,000voltsbetweenthem.Asanele

7、ctronismovedfromthenegativetothepositiveplate(a)whathappenstotheelectricpotentialenergyoftheelectron(b)whathappenstotheelectrostaticforceontheelectron(c)whathappenstotheelectricpotentialatthelocationoftheelectron(d)calculatetheelectricfieldstrengthmidwaybetw

8、eentheplates(e)iftheelectronwerereleasedatthenegativeplate,whatwouldbeitsspeedwhenitreachedthepositiveplate?61.Charges+Qand-QarelocatedadistanceLmetersapartasshownbelow:L-Q+QP(a)Findanexpression