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11 - Kapoor(mk9499 – oldhomework 11 – Turner –(60230...

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Unformatted text preview: Kapoor (mk9499) – oldhomework 11 – Turner – (60230) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points The quantity of charge passing through a sur- face of area 2 . 99 cm 2 varies with time as q = q 1 t 3 + q 2 t + q 3 , where q 1 = 3 . 4 C / s 3 , q 2 = 3 . 6 C / s, q 3 = 5 . 5 C, and t is in seconds. What is the instantaneous current through the surface at t = 1 . 1 s? Correct answer: 15 . 942 A. Explanation: Let : q 1 = 3 . 4 C / s 3 , q 2 = 3 . 6 C / s , q 3 = 5 . 5 C , and t = 1 . 1 s . I ≡ d q dt = 3 q 1 t 2 + q 2 = 3 ( 3 . 4 C / s 3 ) (1 . 1 s) 2 + 3 . 6 C / s = 15 . 942 A . 002 (part 2 of 2) 10.0 points What is the value of the current density at t = 1 . 1 s? Correct answer: 53317 . 7 A / m 2 . Explanation: Let : a = 2 . 99 cm 2 = 0 . 000299 m 2 and t = 1 . 1 s ....
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11 - Kapoor(mk9499 – oldhomework 11 – Turner –(60230...

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