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HW6-problems

# HW6-problems - aliu(fa5484 HW6 mackie(20225 This print-out...

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aliu (fa5484) – HW6 – mackie – (20225) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points The compressor on an air conditioner draws 36 . 6 A when it starts up. The start-up time is about 0 . 313 s. How much charge passes a cross-sectional area of the circuit in this time? Answer in units of C. 002 10.0points The current in a wire decreases with time according to the relationship I = (1 . 17 mA) × e - at where a = 0 . 13328 s - 1 . Determine the total charge that passes through the wire from t = 0 to the time the current has diminished to zero. Answer in units of C. 003(part1of2)10.0points The quantity of charge passing through a sur- face of area 1 . 73 cm 2 varies with time as q = q 1 t 3 + q 2 t + q 3 , where q 1 = 2 . 1 C / s 3 , q 2 = 6 . 1 C / s, q 3 = 6 . 8 C, and t is in seconds. What is the instantaneous current through the surface at t = 1 . 2 s? Answer in units of A.
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