phy2054e2sm11 - 77777 77777 Instructor(s): F.E. Dunnam...

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77777 77777 Instructor(s): F.E. Dunnam PHYSICS DEPARTMENT PHY 2054 Exam 2 11 July 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 76–80 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 this 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 correct answer is listed, leave this item blank !! (6) Hand in the answer sheet separately. Useful (??) Constants: μ 0 = 4 π × 10 - 7 Tm/A ² 0 = 8 . 85 × 10 - 12 C 2 /(Nm 2 ) electron charge = - 1 . 6 × 10 - 19 C electron mass = 9 . 11 × 10 - 31 kg V=volt N=newton J=joule m=meter W=watt μ = “micro-” = 10 - 6 A = ampere “pico” = 10 - 12 n = “nano” = 10 - 9 m = “milli” = 10 - 3 proton mass = 1 . 67 × 10 - 27 kg c = 3 × 10 8 m/s “mega” = 10 6 1. A flat conducting coil (area = 5 cm 2 ) of copper wire mounted near the earth’s surface and connected to a voltmeter detects, via induced emf in the coil, a vertical lightning bolt striking the earth. Suppose that the lightning bolt strikes the ground 100 m distant from the coil, and the bolt has an initial current of 10 mega amperes, dropping to zero in 10 microseconds. If the voltmeter reads 30 volts, how many turns of wire are in the coil and how should the coil be oriented so as to maximize the reading? 100 m
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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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phy2054e2sm11 - 77777 77777 Instructor(s): F.E. Dunnam...

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