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Unformatted text preview: gonzales (pag757) Homework 4 Hoffmann (56745) 1 This printout should have 20 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points A proton is released from rest in a uniform electric field of magnitude 90000 V / m di rected along the positive x axis. The proton undergoes a displacement of 0 . 6 m in the di rection of the electric field as shown in the figure. The mass of a proton is 1 . 672623 10 27 kg. + + + + + + + + + + + + + v A = 0 + . 6 m v 90000 V / m A B Find the change in the electric potential if the proton moves from the point A to B . Answer in units of V. 002 (part 2 of 3) 10.0 points Find the change in potential energy of the proton for this displacement. Answer in units of J. 003 (part 3 of 3) 10.0 points Apply the principle of energy conservation to find the speed of the proton after it has moved . 6 m, starting from rest. Answer in units of m / s. 004 (part 1 of 2) 10.0 points An electron moving parallel to the x axis has an initial speed of 3 10 6 m / s at the origin. Its speed is reduced to 5 10 5 m / s at the point x P , 5 cm away from the origin. The mass of the electron is 9 . 10939 10 31 kg and the charge of the electron is 1 . 60218 10 19 C. Calculate the absolute value of the poten tial difference between this point and the ori gin. Answer in units of V. 005 (part 2 of 2) 10.0 points Consider the setup from part one. Let U and V denote the potential energy and the electric potential at the origin. Let U P and V P denote the potential energy and the electric potential at the final point x P of the electron. Which of the following statements is true? 1. None of these. 2. V P > V and U P > U 3. V P < V and U P < U 4. V P = V and U P < U 5. V P > V and U P = U 6. V P > V and U P < U 7. V P < V and U P > U 8. V P = V and U P = U 9. V P < V and U P = U 10. V P = V and U P > U 006 (part 1 of 3) 10.0 points Four charges are placed at the corners of a square of side a , with Q 1 = Q 2 = q ,...
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 Spring '08
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