PHY 2054 Final Fall 2010 Key

PHY 2054 Final Fall 2010 Key - 77777 Instructor(s):...

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77777 77777 Instructor(s): Reitze/Kumar PHYSICS DEPARTMENT PHY2054 Final Exam December 11, 2010 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5-digit number) . Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY . Code your UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink . Do not make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. If you believe that no listed answer is correct, leave the form blank. (6) Hand in the answer sheet separately. Useful Constants: k e = 8 . 99 × 10 9 Nm 2 /C 2 ² 0 = 8 . 85 × 10 - 12 C 2 /(Nm 2 ) V=volt N=newton μ 0 = 4 π × 10 - 7 Tm/A k 0 = μ 0 / (4 π ) = 10 - 7 Tm/A c = 3 × 10 8 m/s g = 9 . 8 m/s 2 electron charge = - 1 . 6 × 10 - 19 C electron mass = 9 . 11 × 10 - 31 kg C=coulomb “milli”=10 - 3 “micro”=10 - 6 n=“nano”=10 - 9 “pico”=10 - 12 J=joule m=Meter 1. Two equal and opposite point charges + Q and - Q are located on the y-axis at y = d/ 2 and y = - d/ 2 as shown in the figure. What is the magnitude of the electric field on the x-axis a distance x = d/ 2 from the origin? +Q d x -Q x-axis y-axis (1) 2 . 83 k e Q/d 2 (2) 1 . 41 k e Q/d 2 (3) 0 . 71 k e Q/d 2 (4) 5 . 6 k e Q/d 2 (5) 4 k e Q/d 2 2. Four point charges form a square with sides of length L as shown in the figure. Three of the charges have charge + Q and one has charge - Q . What is the minimum amount of work that must be done ( against the electric force ), to move the - Q charge to infinity? L
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PHY 2054 Final Fall 2010 Key - 77777 Instructor(s):...

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