phy2049e2sm10 - 77777 77777 Instructor: Prof. P. Kumar...

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77777 77777 Instructor: Prof. P. Kumar PHYSICS DEPARTMENT PHY 2049 Exam 2, Summer 2010 July 14, 2010 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. DIRECTIONS (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 (errors can occur if too light) . Code your student number on your answer sheet. (2) Blacken the circle of your intended answer completely, using a number 2 pencil . Do not make any stray marks or the answer sheet may not read properly. (3) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. Table of constants k = 1 4 π² 0 = 9 × 10 9 e = 1 . 6 × 10 - 19 C m e = 9 . 11 × 10 - 31 kg c = 3 × 10 8 m/s 1. At a certain position outside Gainesville, the magnetic field of the Earth is 39 μ T, horizontal to the surface, and directed due North. If the magnitude of the total field is exactly zero 8 cm above a long straight, horizontal wire that carries a constant current i , what is the magnitude and direction of the current? (1) 16 A, west to east (2) 8 A, north to south (3) 16 A, east to west (4) 4.2 A, west to east (5) 8 A, south to north
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phy2049e2sm10 - 77777 77777 Instructor: Prof. P. Kumar...

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