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Electric Energies and Potentials

Electric Energies and Potentials. A positive charge might be placed at one of three spots in a region where there is a uniform electric field . How does the electric potential energy, U elec , on the charge at positions 1, 2, and 3 compare?. U is greatest at 1

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Electric Energies and Potentials

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  1. Electric Energies and Potentials

  2. A positive charge might be placed at one of three spots in a region where there is a uniform electric field. How does the electric potential energy, Uelec, on the charge at positions 1, 2, and 3 compare? • Uis greatest at 1 • Uis greatest at 2 • Uis greatest at 3 • Uis 0 at all 3 spots • Uis = at all 3 spots but not = 0. NEXUS/Physics Clicker Questions

  3. When a positive test charge is released from rest near a (fixed) positive source charge, what happens to the electric potentialof the positive test charge? • It will increase because the charge will move in the direction of the electric field. • It will decrease because the charge will move in the direction opposite to the electric field. • It will decrease because the charge will move in the direction of the electric field. • It will remain constant because the electric field is uniform. • It will remain constant because the charge remains at rest. NEXUS/Physics Clicker Questions

  4. When a negative test charge is released from rest near a (fixed) positive source charge, what happens to the electric potentialof the positive test charge? • It will increase because the charge will move in the direction of the electric field. • It will decrease because the charge will move in the direction opposite to the electric field. • It will decrease because the charge will move in the direction of the electric field. • It will remain constant because the electric field is uniform. • It will remain constant because the charge remains at rest. NEXUS/Physics Clicker Questions

  5. Two test charges are brought separately into the vicinity of a charge +Q. First, test charge +q is brought to point A a distance r from +Q. Next, +qis removed and a test charge +2q is brought to point B a distance 2r from +Q. Compared with the electrostatic potentialof the charge at A, that of the charge at B is 1. greater 2. smaller 3. the same 4. you can’t tell from the information given NEXUS/Physics Clicker Questions

  6. Two test charges are brought separately into the vicinity of a charge +Q. First, test charge +q is brought to point A a distance r from +Q. Next, +qis removed and a test charge +2q is brought to point B a distance 2r from +Q. Compared with the electrostatic potential energyof the charge at A, that of the charge at B is 1. greater 2. smaller 3. the same 4. you can’t tell from the information given NEXUS/Physics Clicker Questions

  7. A positive charge might be placed at one of three spots in a region where there is a uniform electric field. How do the electric potential, V, on the charge at positions 1, 2, and 3 compare? • Vis greatest at 1 • Vis greatest at 2 • Vis greatest at 3 • V is 0 at all 3 spots • V is = at all 3 spots but not = 0. NEXUS/Physics Clicker Questions

  8. A mass might be placed at one of three spots in a region where there is a uniform gravitational field. How do the gravitational potentials, V = gh, on the mass at positions 1, 2, and 3 compare? • Vis greatest at 1 • Vis greatest at 2 • Vis greatest at 3 • V is 0 at all 3 spots • V is = at all 3 spots but not = 0. NEXUS/Physics Clicker Questions

  9. Topo map = grav PE graph (2D) At which point is the force downhill the strongest? • A • B • C NEXUS/Physics Clicker Questions

  10. Topo map = grav PE graph (2D) At which point is the force downhill pointing to the east? (North is up) • A • B • C • None NEXUS/Physics Clicker Questions

  11. Topo map = grav PE graph (2D) At which point is the force downhill pointing to the north? (North is up) • A • B • C • None NEXUS/Physics Clicker Questions

  12. Model of PE for 2 line charges Where would a test charge feel the strongest electric force? • A • B • C • A and B NEXUS/Physics Clicker Questions

  13. Model of PE for 2 line charges Where would a test charge feel the strongest electric force? • A • B • C • A and B • It would feel no force at any of the three points NEXUS/Physics Clicker Questions

  14. Map of electric PE for 3 charges (water molecule) (3D) Where would a test charge feel the strongest electric force? • A • B • C • D • E • More than one NEXUS/Physics Clicker Questions

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