Rice PHYS 102 - Electric Potential Energy I

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ConcepTest 24.1a Electric Potential Energy I ConcepTest 24.1a Electric Potential Energy I ConcepTest 24.1b Electric Potential Energy II ConcepTest 24.1b Electric Potential Energy II ConcepTest 24.1c Electric Potential Energy III ConcepTest 24.1c Electric Potential Energy III ConcepTest 24.2 Work and Potential EnergyConcepTest 24.2 Work and Potential EnergySlide Number 9Slide Number 10ConcepTest 24.3a Electric Potential IConcepTest 24.3a Electric Potential IConcepTest 24.3b Electric Potential IIConcepTest 24.3b Electric Potential IIConcepTest 24.4 Hollywood SquareConcepTest 24.4 Hollywood SquareConcepTest 24.5a Equipotential Surfaces IConcepTest 24.5a Equipotential Surfaces IConcepTest 24.5b Equipotential Surfaces IIConcepTest 24.5b Equipotential Surfaces IIConcepTest 24.5c Equipotential Surfaces IIIConcepTest 24.5c Equipotential Surfaces IIIConcepTest 24.6 Equipotential of Point ChargeConcepTest 24.6 Equipotential of Point ChargeSlide Number 25Slide Number 26ConcepTest 24.7a Work and Electric Potential IConcepTest 24.7a Work and Electric Potential IConcepTest 24.7b Work and Electric Potential IIConcepTest 24.7b Work and Electric Potential IISlide Number 31Slide Number 32Slide Number 33Slide Number 34Slide Number 35Slide Number 36ConcepTest 24.1a Electric Potential Energy I 1) proton2) electron3) both feel the same force4) neither – there is no force5) they feel the same magnitude force but opposite directionEGelectronprotonEGelectronproton+-A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electronfrom the negative side. Which feels the larger electric force?ConcepTest 24.1a Electric Potential Energy I 1) proton2) electron3) both feel the same force4) neither – there is no force5) they feel the same magnitude force but opposite directionEGelectronprotonEGelectronproton+-Since F = qE and the proton and electron have the same charge in magnitude, they both experience the same force. However, the forces point in opposite directionsbecause the proton and electron are oppositely charged.A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electronfrom the negative side. Which feels the larger electric force?EGelectronprotonEGelectronproton+-1) proton2) electron3) both feel the same acceleration4) neither – there is no acceleration5) they feel the same magnitude acceleration but opposite directionA proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electronfrom the negative side. Which has the larger acceleration?ConcepTest 24.1b Electric Potential Energy IIEGelectronprotonEGelectronproton+-1) proton2) electron3) both feel the same acceleration4) neither – there is no acceleration5) they feel the same magnitude acceleration but opposite directionSince F = ma and the electron is much less massive than the proton, then the electron experiences the larger acceleration.A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electronfrom the negative side. Which has the larger acceleration?ConcepTest 24.1b Electric Potential Energy IIEGelectronprotonEGelectronproton+-1) proton2) electron3) both acquire the same KE4) neither – there is no change of KE5) they both acquire the same KE but with opposite signsConcepTest 24.1c Electric Potential Energy III A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electronfrom the negative side. When it strikes the opposite plate, which one has more KE?EGelectronprotonEGelectronproton+-1) proton2) electron3) both acquire the same KE4) neither – there is no change of KE5) they both acquire the same KE but with opposite signsSince PE = qV and the proton and electron have the same charge in magnitude, they both have the same electric potential energyinitially. Because energy is conserved, they both must have the same kinetic energy after they reach the opposite plate.ConcepTest 24.1c Electric Potential Energy III A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electronfrom the negative side. When it strikes the opposite plate, which one has more KE?Which group of charges took more work to bring together from a very large initial distance apart?+1+1+1d dd+1+2dBoth took the same amount of workConcepTest 24.2 Work and Potential EnergyThe work needed to assemble a collection of charges is the same as the total PE of those charges:rQQkPE21=Which group of charges took more work to bring together from a very large initial distance apart?+1+1+1d dd+1+2dBoth took the same amount of workFor case 1: only 1 pairdkdkPE212=++=))((For case 2: there are 3 pairsdkdkPE13113 =++=))((added over all pairsConcepTest 24.2 Work and Potential EnergyRank in order, from largest to smallest, the potential energies Uato Udof these four pairs of charges. Each + symbol represents the same amount of charge.A. Ua= Ub> Uc= UdB. Ua= Uc> Ub= UdC. Ub= Ud> Ua= UcD. Ud> Ub= Uc> UaE. Ud> Uc> Ub> UaRank in order, from largest to smallest, the potential energies Uato Udof these four pairs of charges. Each + symbol represents the same amount of charge.A. Ua= Ub> Uc= UdB. Ua= Uc> Ub= UdC. Ub= Ud> Ua= UcD. Ud> Ub= Uc> UaE. Ud> Uc> Ub> Ua1) V > 02) V = 03) V < 0ABWhat is the electric potential at point A?ConcepTest 24.3a Electric Potential ISince Q2(which is positive) is closerto point A than Q1(which is negative) and since the total potential is equal to V1+ V2, then the total potential is positive.1) V > 02) V = 03) V < 0ABWhat is the electric potential at point A?ConcepTest 24.3a Electric Potential I1) V > 02) V = 03) V < 0ABWhat is the electric potential at point B?ConcepTest 24.3b Electric Potential IISince Q2and Q1are equidistant from point B, and since they have equal and opposite charges, then the total potential is zero.1) V > 02) V = 03) V < 0ABWhat is the electric potential at point B?ConcepTest 24.3b Electric Potential IIFollow-up: What is the potential at the origin of the x-y axes?Four point charges are arranged


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Rice PHYS 102 - Electric Potential Energy I

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