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© 2012 Pearson Education, Inc. Two rocks have equal mass. Which has more gravitational potential energy? A.Rock A. B.Rock B. C.They have the same potential.

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Presentation on theme: "© 2012 Pearson Education, Inc. Two rocks have equal mass. Which has more gravitational potential energy? A.Rock A. B.Rock B. C.They have the same potential."— Presentation transcript:

1 © 2012 Pearson Education, Inc. Two rocks have equal mass. Which has more gravitational potential energy? A.Rock A. B.Rock B. C.They have the same potential energy. D.Both have zero potential energy. Slide 28-25

2 © 2012 Pearson Education, Inc. Two positive charges are equal. Which has more electric potential energy? A.Charge A. B.Charge B. C.They have the same potential energy. D.Both have zero potential energy. Slide 28-28

3 © 2012 Pearson Education, Inc. Two negative charges are equal. Which has more electric potential energy? A. Charge A. B. Charge B. C. They have the same potential energy. D. Both have zero potential energy.

4 © 2012 Pearson Education, Inc. A and B are an electron and proton respectively. Which has more electric potential energy? A. The electron A. B. The proton B. C. They have the same potential energy. D. Both have zero potential energy.

5 © 2012 Pearson Education, Inc. A and B are two neutral hydrogen atoms. Which has more electric potential energy? A. Atom A. B. Atom B. C. They have the same potential energy. D. Both have zero potential energy.

6 © 2012 Pearson Education, Inc. A positive and a negative charge are released from rest in vacuum. They move toward each other. As they do: A.A positive potential energy becomes more positive. B.A positive potential energy becomes less positive. C.A negative potential energy becomes more negative. D.A negative potential energy becomes less negative. E.A positive potential energy becomes a negative potential energy.

7 © 2012 Pearson Education, Inc. A positively charged object and a negatively charged object are pulled away from one another. Then: A. the electric potential energy increases. B. the electric potential energy stays the same. C. the electric potential energy decreases.

8 © 2012 Pearson Education, Inc. A.positive. B.B. negative. C. zero. D. not enough information given to decide Charge #1 Charge #2 Charge #3 +q+q +q+q –q–q x y The electric potential energy of two point charges approaches zero as the two point charges move farther away from each other. If the three point charges shown here lie at the vertices of an equilateral triangle, the electric potential energy of the system of three charges is

9 © 2012 Pearson Education, Inc. The electric potential due to a point charge approaches zero as you move farther away from the charge. If the three point charges shown here lie at the vertices of an equilateral triangle, the electric potential at the center of the triangle is A.positive. B.B. negative. C. zero. D. not enough information given to decide Charge #1 Charge #2 Charge #3 +q+q +q+q –q–q x y

10 © 2012 Pearson Education, Inc. At the midpoint between these two equal but opposite charges, A. E  0; V = 0. B. E  0; V > 0. C. E  0; V < 0. D. E points right; V = 0. E. E points left; V = 0.

11 © 2012 Pearson Education, Inc. At which point or points is the electric potential zero? A.B.C.D. E. More than one of these.

12 © 2012 Pearson Education, Inc. A positive charge moves as shown. Its kinetic energy A. Increases. B. Remains constant. C. Decreases. Slide 28-35

13 © 2012 Pearson Education, Inc. An electron follows the trajectory shown from point 1 to point 2. At point 2, A. v 2 > v 1. B. v 2 = v 1. C. v 2 < v 1. D. Not enough information to compare the speeds at these points.

14 © 2012 Pearson Education, Inc. Two protons, one after the other, are launched from point 1 with the same speed. They follow the two trajectories shown. The protons’ speeds at points 2 and 3 are related by A. v 2 > v 3. B. v 2 = v 3. C. v 2 < v 3. D. Not enough information to compare their speeds.

15 © 2012 Pearson Education, Inc. Two conducting spheres, one charged other neutral

16 © 2012 Pearson Education, Inc. If a positive charge is released from rest, it moves in the direction of A.A stronger electric field. B.A weaker electric field. C.Higher electric potential. D.Lower electric potential. E.Both B and D.

17 © 2012 Pearson Education, Inc. A proton is released from rest at the dot. Afterward, the proton A.Remains at the dot. B.Moves upward with steady speed. C.Moves upward with an increasing speed. D.Moves downward with a steady speed. E.Moves downward with an increasing speed.

18 © 2012 Pearson Education, Inc. Slide 28-35

19 © 2012 Pearson Education, Inc. A.positive. B.B. negative. C. zero. D. not enough information given to decide The electric potential energy of two point charges approaches zero as the two point charges move farther away from each other. If the three point charges shown here lie at the vertices of an equilateral triangle, the electric potential energy of the system of three charges is Charge #1 Charge #2 Charge #3 +q+q –q–q –q–q x y

20 © 2012 Pearson Education, Inc. Consider a point P in space where the electric potential is zero. Which statement is correct? A. A point charge placed at P would feel no electric force. B. The electric field at points around P is directed toward P. C. The electric field at points around P is directed away from P. D. none of the above E. not enough information given to decide

21 © 2012 Pearson Education, Inc. Metal spheres 1 and 2 are connected by a metal wire. What quantities do spheres 1 and 2 have in common? A. Same potential. B. Same electric field. C. Same charge. D. Both A and B. E. Both A and C.

22 © 2012 Pearson Education, Inc. Two identical balloons are connected after blowing one up to about ½ its maximum volume, the other to about ¼ its maximum volume. When the valve is turned so air can equalize between the two balloons (a) The balloons will become equal in size. (b) The large balloon will become a bit smaller, the small balloon a bit bigger. (a) The large balloon will become bigger, the small balloon smaller. (a) Nothing will happen.

23 © 2012 Pearson Education, Inc. At the midpoint between these two equal but opposite charges, A. E  0; V = 0. B. E  0; V > 0. C. E  0; V < 0. D. E points right; V = 0. E. E points left; V = 0.

24 © 2012 Pearson Education, Inc. Where is the electric potential zero? A.B.C.D. E. More than one of these. http://phet.colorado.edu/sims/charges-and-fields/charges-and-fields_en.html

25 © 2012 Pearson Education, Inc.

26 Estimate E along shortest path between two equipotential contours.

27 © 2012 Pearson Education, Inc. A particle follows the trajectory shown from initial position i to final position f. The potential difference  V is A. B. C. D. E. 100 V. 50 V. 0 V.  50 V.  100 V.

28 © 2012 Pearson Education, Inc. A proton is released from rest at the dot. Afterward, the proton A.Remains at the dot. B.Moves upward with steady speed. C.Moves upward with an increasing speed. D.Moves downward with a steady speed. E.Moves downward with an increasing speed.

29 © 2012 Pearson Education, Inc. Which set of equipotential surfaces matches this electric field?

30 © 2012 Pearson Education, Inc. This is a graph of the x-component of the electric field along the x-axis. The potential is zero at the origin. What is the potential at x  1m? A. 2000 V. B. 1000 V. C. 0 V. D. E.  1000 V.  2000 V.

31 © 2012 Pearson Education, Inc. At which point is the electric field stronger? A.At x A. B.At x B. C.The field is the same strength at both. D.There’s not enough information to tell.

32 © 2012 Pearson Education, Inc. An electron is released from rest at x  2 m in the potential shown. What does the electron do right after being released? A. Stay at x  2 m. B. Move to the right (  x) at steady speed. C. Move to the right with increasing speed. D. Move to the left (  x) at steady speed. E. Move to the left with increasing speed.

33 © 2012 Pearson Education, Inc. The electric field at the dot is A. B. C. D. E. 10î V/m.  10î V/m. 20î V/m. 30î V/m.  30î V/m.

34 © 2012 Pearson Education, Inc. Metal wires are attached to the terminals of a 3 V battery. What is the potential difference between points 1 and 2? A. 6 V. B. 3 V. C. 0 V. D. Undefined. E. Not enough information to tell.

35 © 2012 Pearson Education, Inc. What is the electric field magnitude E at point 5? (a) 0 N/C (b) 1500 N/C (c) 3000 N/C (d) 6000 N/C (e) Not enough information


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