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U=qv or u=0.5qv - Physics Forums

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U=qV is used for a charge (q) in an electrostatic potential (V). "U" is then the electric potential energy the charge has in that field. InsightsBlog Forums Trending FeaturedThreads Login Register What'snew Search IntroPhysicsHomeworkHelp AdvancedPhysicsHomeworkHelp PrecalculusHomeworkHelp CalculusHomeworkHelp Bio/ChemHomeworkHelp EngineeringHomeworkHelp Menu Login Register Navigation Moreoptions Contactus CloseMenu Youareusinganoutofdatebrowser.Itmaynotdisplaythisorotherwebsitescorrectly.Youshouldupgradeoruseanalternativebrowser. Forums HomeworkHelp AdvancedPhysicsHomeworkHelp U=qvoru=0.5qv Threadstarter sonutulsiani Startdate Mar8,2010 sonutulsiani 138 0 HomeworkStatement OkIamreallyconfused! Sometimesweuseu=qvtofindthepotentialenergy andsometimesu=0.5qv Whichoneiscorrect? HomeworkEquations u=electrostaticpotentialenergy v=voltage qischarge TheAttemptataSolution   AnswersandReplies nickjer 674 2 Thatquestionisveryvague.Youwillhavetobemorespecificoftheproblem. U=qVisusedforacharge(q)inanelectrostaticpotential(V)."U"isthentheelectricpotentialenergythechargehasinthatfield. IamnotsureaboutU=0.5qV,sincethatisveryvague.Ifyoucangiveanexamplewhereitisused,thenyoumightbeabletonarrowitdown.   sonutulsiani 138 0 likeforenergyinacapacitoritsused   nickjer 674 2 Theenergystoredinacapacitorisverydifferentthanasinglepointchargeinanelectricfield.Theenergystoredinacapacitorisactuallyanintegralovermanyinfinitesmalpointcharges,dq.Sinceitisasum,youcan'texpectittolooklikeqV.   sonutulsiani 138 0 Apparentlymytextbookwritespotentialenergyof2pointchargesisu=qv andelectrostaticpotentialenergyisu=1/2qv.Whatisthedifferencebetweenthemotherthantheword'electrostatic'   nickjer 674 2 Electrostaticjustmeanstheelectricfieldisn'tchangingwithtime.Soyoucanuseitinterchangeablywithelectricformostofyourcases.Youcansaytheelectrostaticpotentialenergyof2pointchargesisU=qV,sincethereisnotimedependencethatwouldcausemagneticfields. ForyourU=1/2qV,youmustbereadingaboutcapacitanceandthestoredenergyintheelectricfieldofthecharges.Theyarebothdifferent,andshouldn'tgetthemtooconfusedfromaquestionyoumightbeasked.   Alihammoud 1 0 u=qvisforelectricalpotentialenergy forthosewhogavetheexampleofcapacitors: u=0.5cv^2   lepton5 26 0 sonutulsianisaid: HomeworkStatement OkIamreallyconfused! Sometimesweuseu=qvtofindthepotentialenergy andsometimesu=0.5qv Whichoneiscorrect? Iwilltrytosharptwoeqnabovebasedoncommontextbook, 1)[tex]W=q.[V(a)-V(b)][/tex] thiseqntellsusfortheworkdonetomoveachargefrompoint(a)topoint(b).Vheremeanspotentialdifferencebetweenpoints(a)and(b). 2)[tex]W=\frac{1}{2}\Sigma^{n}_{i=1}q_iV(r_i)[/tex] thiseqntellsaboutworkittakestoassembleaconfigurationofpointcharge.soWhererepresentsenergystoredintheconfiguration.factor1/2hereisusedtorestoretheeqnthatinitiallycounttwice.(ifyouconfusedwhatImean,youcancheckforyourselfthederivationofthiseqn).thiseqnismoreabouttheenergyofapointchargedistribution.   Share: Share Suggestedfor:U=qvoru=0.5qv (u.∇)u=∇(1/2u^2)+w∧u LastPost Dec3,2009 Replies 13 Views 3K UnitaryoperatorU? LastPost Jan30,2012 Replies 3 Views 3K Utubequestion: LastPost Sep30,2008 Replies 3 Views 3K H=u+pv LastPost Oct6,2008 Replies 2 Views 15K TandUparadox LastPost Oct13,2008 Replies 3 Views 2K WhyisU-235fissionablebythermalneutronsbutU-238not LastPost May7,2007 Replies 2 Views 3K WhenwasU-238andU-23550%atthesametime? LastPost May21,2010 Replies 3 Views 3K CalculatingexpectationvalueofU LastPost Feb6,2016 Replies 15 Views 1K MinkowskispacetimeasU(2) LastPost Apr17,2021 Replies 1 Views 566 JouleCoefficientatConstantU LastPost Jun12,2014 Replies 5 Views 2K Forums HomeworkHelp AdvancedPhysicsHomeworkHelp HotThreads Chapter2GriffithsEMProblem:E-Fieldfromachargedring DeductionofformulaforLagrangiandensityforaclassicalrelativisticfield Quantumexampractice,operatorsandeigenstates TongQFTsheet2,question6:Normalorderingoftheangularmomentumoperator DoublepulleyproblemusingLagrangian RecentInsights Insights ÉvaristeGaloisandHisTheory Insights YardstickstoMetricTensorFields Insights ProgramminganATmega8AusingArduino Insights Pvs.NPconjectureandwhatisaTuringMachine(TM)? Insights QuantumComputingforBeginners Insights APhysicsMisconceptionwithGauss’Law Top

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