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Unformatted text preview: 77777 77777 PHYSICS DEPARTMENT PHY 2054 1st Exam Fall, 2006 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5DIGIT 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 5digit 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. Constants g = 9 . 80 m/s 2 e = 1 . 6 × 10 19 C 1 μ C = 10 6 C G = 6 . 67 × 10 11 Nm 2 /kg 2 m e = 9 . 11 × 10 31 kg 1nC = 10 9 C k E = 8 . 99 × 10 9 Nm 2 /C 2 m p = m n = 1 . 67 × 10 27 kg 1pC = 10 12 C ² = 8 . 85 × 10 12 C 2 /N/m 2 1 eV = 1 . 6 × 10 19 J c = 3 × 10 8 m/s 1. Three charges Q 1 = +5 μ C, Q 2 = 6 μ C and Q 3 = +9 μ C produce an electric field of strength E at a point P. All 3 charges are now doubled. The new field at P is (1) 2 E (2) 3 E (3) 4 E (4) 9 E (5) E 2. Three charges Q 1 = 3 μ C, Q 2 = 6 μ C and Q 3 = +9 μ C produce an electric field of strength E at a point P. All 3 charges are now tripled. The new field at P is (1) 3 E (2) 2 E (3) 4 E (4) 9 E (5) E 3. Three charges Q 1 = +5 μ C, Q 2 = 6 μ C and Q 3 = +9 μ C produce an electric field of strength E at a point P. All 3 charges are now quadrupled. The new field at P is (1) 4 E (2) 3 E (3) 2 E (4) 16 E (5) E 4. Two identical small insulated conducting spheres, whose centers are 18.9 cm apart, carry charges Q 1 = 100 μ C and Q 2 = 200 μ C, respectively. The spheres are kept insulated, but you bring them into mutual contact and then you put them back into their original positions. How much does the potential energy (in J) between the 2 spheres change from the initial to the final configuration? (1) 119 (2) 96 (3) 81 (4) 119 (5) 96 5. Two identical small insulated conducting spheres, whose centers are 23.4 cm apart, carry charges Q 1 = 200 μ C and Q 2 = 100 μ C, respectively. The spheres are kept insulated, but you bring them into mutual contact and then you put them back into their original positions. How much does the potential energy (in J) between the 2 spheres change from the initial to the final configuration?...
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 Spring '08
 Avery
 Physics, Capacitance, Electric Potential, Orders of magnitude, Electric charge

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