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Unformatted text preview: 77777 77777 Instructor(s): Reitze/Kumar PHYSICS DEPARTMENT PHY 2054 Exam 1 February 16, 2011 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 7680 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 = 8 . 85 10- 12 C 2 /(Nm 2 ) V=volt N=newton electron charge =- 1 . 6 10- 19 C electron mass = 9 . 11 10- 31 kg J=joule m=Meter milli=10- 3 micro=10- 6 n=nano=10- 9 pico=10- 12 C=coulomb g = 9 . 8 m/s 2 1. If the electric field has a magnitude of 4 N/C at a distance of 1 meter from an isolated point charge, at what distance (in m) is the magnitude of the electric field equal to 0.5 N/C? (1) 2.83 (2) 0.82 (3) 0.63 (4) 0.58 (5) 1.58 2. If the electric field has a magnitude of 4 N/C at a distance of 1 meter from an isolated point charge, at what distance (in m) is the magnitude of the electric field equal to 6 N/C? (1) 0.82 (2) 2.83 (3) 0.63 (4) 0.58 (5) 1.58 3. If the electric field has a magnitude of 4 N/C at a distance of 1 meter from an isolated point charge, at what distance (in m) is the magnitude of the electric field equal to 10 N/C? (1) 0.63 (2) 0.82 (3) 2.83 (4) 0.58 (5) 1.58 4. An electron traveling north enters a region where the electric field is uniform and points north. The electron will then: (1) slow down (2) speed up (3) veer east (4) veer west (5) continue with the same speed in the same direction 5. Two charged particles are arranged as shown in the figure with the +2C charge on the left and the- 4C charge on the right. In which region could a third particle, with charge +1C, be placed so that the net electrostatic force on it is zero? +2C - 4C Region 1 Region 2 Region 3 (1) Region 1 only (2) Region 1 and 2 only (3) Region 3 only (4) Region 1 and 3 only (5) Region 2 only 6. A 1 gram particle with a charge of 1 milliC starts from rest in a uniform electric field. If the particle moves 5 m in 2 seconds, what is the magnitude of the electric field (in N/C)?...
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