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Unformatted text preview: aldawsari (ma28683) – HW07 – Betancourt – (16856) 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 25.125.5 001 (part 1 of 2) 10.0 points The current I = a t 2 b t + c in a section of a conductor depends on time. What quantity of charge moves across the section of the conductor from t = 0 to t = t 1 ? 1. q = a t 3 1 b t 2 + c t 1 2. q = a t 2 1 b t 1 + c 3. q = a 3 t 3 1 b 2 t 2 1 + c 4. q = a t 3 1 b 2 t 2 1 + c t 1 5. q = a 3 t 3 1 b 2 t 2 1 + c t 1 correct Explanation: The unit of current is Coulomb per second I = d q dt or dq = I dt . To find the total charge in coulombs that passes through the conductor, one must inte grate the current over the time interval. q = integraldisplay t 1 dq = integraldisplay t 1 I dt = integraldisplay t 1 ( a t 2 b t + c ) dt = bracketleftbigg a 3 t 3 1 b 2 t 2 1 + c t bracketrightbiggvextendsingle vextendsingle vextendsingle vextendsingle t 1 = a 3 t 3 1 b 2 t 2 1 + c t 1 . 002 (part 2 of 2) 10.0 points If I is in A, and a = 2 C / s 3 , b = 3 C / s 2 , and c = 10 C / s, what quantity of charge moves across the section of the conductor from...
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This note was uploaded on 01/27/2011 for the course PHYS 251 taught by Professor Gavrine during the Spring '10 term at Purdue.
 Spring '10
 Gavrine
 Current

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