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Qwizdom questions for Dec. 17, 2009 16. Which of the following is not a vector? A. B. C. D. electric force electric field electric potential electric line of force 16. The correct answer is C, electric potential, V. 17. One joule per coulomb is a A. B. C. D. newton volt electron-volt farad 17. The answer is B, a volt. Recall that PE electric potential difference V q So, using units: 1 volt = 1 joule/coulomb 18.The potential at a distance of 2.0 m from a positive point charge is 100 V. What is the potential 4.0 m away from the same point charge? A. B. C. D. 25 V 50 V 200 V 400 V 18. The answer is B, 50 volts. kQ V r So if r is doubled, V will be ½ as large. 19.The potential at the exact center of a square is 3.0 V when a charge of +Q is located at one of the square's corners. What is the potential at the square's center when each of the other corners is also filled with a charge of +Q? A) zero B) 3.0 V C) 9.0 V D) 12 V 19. The correct answer is D, 12 V. Since V is a scalar quantity and the distance from the center to each corner is the same, V2 4V1 4 (3 V) = 12 V 20. The electron-volt is a unit of A. B. C. D. voltage current power energy 20. The correct answer is D, energy. 1 eV = (1.60 10-19 C) (1 V) = 1.60 10-19 J Done with Qwizdom