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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