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Unformatted text preview: 77777 77777 Instructor(s): Acosta/Qiu PHYSICS DEPARTMENT PHY 2049, Fall 2011 Midterm 2 November 8, 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. Constants: e = 1 . 6 10- 19 C m p = 1 . 67 10- 27 kg m e = 9 . 1 10- 31 kg o = 8 . 85 10- 12 C 2 /N m 2 k = 1 / (4 o ) = 9 10 9 N m 2 /C 2 nano = 10- 9 micro = 10- 6 pico = 10- 12 = 4 10- 7 T m/A c = 1 / = 3 10 8 m/s 1. A horizontal power line carries a current of 2900A from south to north Earths magnetic field, with a magnitude of 60 T, is directed toward the north with a dip angle 60 downward into the Earth relative to the horizontal. Find the magnitude and direction (use compass directions) of the magnetic force acting on a 100 m length of power line. (1) 15 N, West (2) 15 N, East (3) 17.5 N, West (4) 8.7 N, East (5) 17.5 N, East 2. A beam of electrons (cathode rays) is sent between two parallel electric plates with an electric field between them of ~ E = 2 10 4 j N/C. If the electron beam travels perpendicular to the electric field with a velocity of ~v = 4 . 2 10 7 i m/s, what magnetic field is necessary (direction and magnitude) so that the electrons...
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