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1. A proton is made to move freely inside a region between two infinite planes of charge with charge densities +σ and -σ. Which of the following statements is TRUE? A. The electric potential energy of the system increased. B. The electric force did negative work on the proton. C. The electric potential energy of the system decreased. D. The electric force did zero work on the proton. You move two protons from infinity (i.e. very far away from each other) to a separation distance of do. After fixing their locations, what is the potential energy of the assembly? 2. A. - ke²/ (do) B. ke²/(2do) C. ke²/(2do) D. ke²/ (do) 3. Point charges +Q and +2Q are placed at x = -a and x = a, respectively. The electric potential energy of the system is: A. KQ²/a C. kQ2/(4a) D. 2kQ²/a B. kQ2/(2a)

1. A proton is made to move freely inside a region between two infinite planes of charge with charge densities +σ and -σ. Which of the following statements is TRUE? A. The electric potential energy of the system increased. B. The electric force did negative work on the proton. C. The electric potential energy of the system decreased. D. The electric force did zero work on the proton. You move two protons from infinity (i.e. very far away from each other) to a separation distance of do. After fixing their locations, what is the potential energy of the assembly? 2. A. - ke²/ (do) B. ke²/(2do) C. ke²/(2do) D. ke²/ (do) 3. Point charges +Q and +2Q are placed at x = -a and x = a, respectively. The electric potential energy of the system is: A. KQ²/a C. kQ2/(4a) D. 2kQ²/a B. kQ2/(2a)

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1. A proton is made to move freely inside a region between two infinite planes of charge with charge densities +σ and -σ. Which of the following statements is TRUE? A. The electric potential energy of the system increased. B. The electric force did negative work on the proton. C. The electric potential energy of the system decreased. D. The electric force did zero work on the proton. 2. You move two protons from infinity (i.e. very far away from each other) to a separation distance of do. After fixing their locations, what is the potential energy of the assembly? A. - ke²/(do) B. - ke²/ (2do) C. ke²/(2do) D. ke²/(do) 3. Point charges +Q and +2Q are placed at x = -a and x = a, respectively. The electric potential energy of the system is: A. kQ²/ a B. kQ2/(2a) C. kQ2/(4a) D. 2KQ²/a 4. B. 4kq²/(a) Five point charges +q are fixed on the xy-plane at the following locations: at x = -a, x = +a, y = -a, y = +a, and at the origin. What is the potential energy of the charge at the origin? A. Zero D. kq²/(4a) C. kq²/(a) 5. Consider the following charges arranged along the x-axis. What is the potential energy of the charge at the origin? -2.00 nC -2q +1.50 nC -1.00 nC qo -9 x = -2.00 cm x=0 x = 1.00 cm A. Zero - B. 1.80 × 103 J C. 2.02 × 10-4 J D. 2.70 × 10-6 J 6. A point charge +q is released in a region of uniform electric field. Which of the following statements is FALSE about the motion of the point charge? A. It will move to a location that will lower its potential energy. B. The work done by the electric force is positive. C. Its potential energy decreases throughout its motion. D. It will accelerate in the direction that is opposite that of the electric field.
Transcribed Image Text:1. A proton is made to move freely inside a region between two infinite planes of charge with charge densities +σ and -σ. Which of the following statements is TRUE? A. The electric potential energy of the system increased. B. The electric force did negative work on the proton. C. The electric potential energy of the system decreased. D. The electric force did zero work on the proton. 2. You move two protons from infinity (i.e. very far away from each other) to a separation distance of do. After fixing their locations, what is the potential energy of the assembly? A. - ke²/(do) B. - ke²/ (2do) C. ke²/(2do) D. ke²/(do) 3. Point charges +Q and +2Q are placed at x = -a and x = a, respectively. The electric potential energy of the system is: A. kQ²/ a B. kQ2/(2a) C. kQ2/(4a) D. 2KQ²/a 4. B. 4kq²/(a) Five point charges +q are fixed on the xy-plane at the following locations: at x = -a, x = +a, y = -a, y = +a, and at the origin. What is the potential energy of the charge at the origin? A. Zero D. kq²/(4a) C. kq²/(a) 5. Consider the following charges arranged along the x-axis. What is the potential energy of the charge at the origin? -2.00 nC -2q +1.50 nC -1.00 nC qo -9 x = -2.00 cm x=0 x = 1.00 cm A. Zero - B. 1.80 × 103 J C. 2.02 × 10-4 J D. 2.70 × 10-6 J 6. A point charge +q is released in a region of uniform electric field. Which of the following statements is FALSE about the motion of the point charge? A. It will move to a location that will lower its potential energy. B. The work done by the electric force is positive. C. Its potential energy decreases throughout its motion. D. It will accelerate in the direction that is opposite that of the electric field.
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