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# finalexam - PHYS 1304 Final exam Part 1 Multiple choice...

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PHYS 1304, Final exam December 14, 2009 Part 1: Multiple choice quiz Correct answers: 1 2 3 4 5 6 7 8 9 10 B C B C F E C D D D Number of students who took the quiz: 62 The percentage of correct answers is shown in brackets. Answer 10 questions in 25 minutes. Indicate all your answers in Rows 1-10 on the Part 1 side of the scantron form. Write your name and student ID on the side of Part 1 of the scantron form. Use a dark pencil or pen to mark the answers. Erase wrong answers completely. Each question has one correct answer. Each question is counted 1 point if answered correctly, 0 points otherwise. No partial credit is given. 1. [59%] Which of the following is FALSE for the electric potential at (only one) point P ? (a) It is a scalar. (b) It allows us to nd the force-per-charge exerted on a charged particle placed at point P . (c) It allows us to nd the electric-potential-energy-per-charge for a charged particle placed at point P . (d) This potential is known up to a position-independent constant. 2. [82%] Given the electric potential V ( x, y, z ) , as a function of the Cartesian coordinates x , y , and z , how does one determine the vector of the electric eld ± E ( x, y, z ) ? (a) By integrating the potential along th e trajectory of the particle. (b) By dividing the change in the potential by the change in distance. (c) The x -component (or y component; or z component) of ± E is determined by taking the negative of the derivative of the electric potential with respect to x (or y ; or z ). (d) By di erentiating with respect to r = x 2 + y 2 + z 2 . 3. [36%] A negative electric charge is placed at rest near the south pole of a magnet. The

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finalexam - PHYS 1304 Final exam Part 1 Multiple choice...

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