phy2054e1f11 - 77777 77777 Instructor(s): Kumar/Stewart...

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Unformatted text preview: 77777 77777 Instructor(s): Kumar/Stewart PHYSICS DEPARTMENT PHY 2054 Exam 1 September 27, 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. Positive charges are arranged at the vertices of an equilateral triangle as shown (all three angles are 60 , all three sides are 1 m in length. At vertex A is 1 C of charge, at vertex B, 3 C, at vertex C, 1 C. Calculate the total of the Coulomb forces on the charge at A from the charges at B and C. What is the ratio of the magnitude of the total force on the charge at A from both charges at B and C in the y-direction to the magnitude of the total force on charge A in the x direction, | F y | / | F x | ? 1 m A B C 60 o (1) 1.04 (2) 0.74 (3) 0.96 (4) 0.87 (5) 1.00 2. Positive charges are arranged at the vertices of an equilateral triangle as shown (all three angles are 60 , all three sides are 1 m in length. At vertex A is 1 C of charge, at vertex B, 3 C, at vertex C, 2 C. Calculate the total of the Coulomb forces on the charge at A from the charges at B and C. What is the ratio of the magnitude of the total force on the charge at A from both charges at B and C in the y-direction to the magnitude of the total force on charge A in the x direction, | F y | / | F x | ? 1 m A B C 60 o (1) 0.74 (2) 1.04 (3) 0.96 (4) 0.87 (5) 1.00 3. Positive charges are arranged at the vertices of an equilateral triangle as shown (all three angles are 60 , all three sides are 1 m in length. At vertex A is 1 C of charge, at vertex B, 2 C, at vertex C, 1 C. Calculate the total of the Coulomb forces on the charge at A from the charges at B and C. What is the ratio of the magnitude of the total force on the charge at A from both charges at B...
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This note was uploaded on 12/15/2011 for the course PHY 2054 taught by Professor Avery during the Spring '08 term at University of Florida.

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phy2054e1f11 - 77777 77777 Instructor(s): Kumar/Stewart...

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