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Homework 9

# Homework 9 - lim(kl9356 Homework 9 Weathers(22202 This...

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lim (kl9356) – Homework 9 – Weathers – (22202) 1 This print-out should have 14 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 1 . 87 cm 2 varies with time as q = q 1 t 3 + q 2 t + q 3 , where q 1 = 4 . 2 C / s 3 , q 2 = 4 . 6 C / s, q 3 = 3 . 6 C, and t is in seconds. What is the instantaneous current through the surface at t = 0 . 4 s? Answer in units of A. 002 (part 2 of 2) 10.0 points What is the value of the current density at t = 0 . 4 s? Answer in units of A / m 2 . 003 10.0 points A conductor with cross-sectional area 9 cm 2 carries a current of 17 A. If the concentration of free electrons in the conductor is 7 × 10 28 electrons / m 3 , what is the drift velocity of the electrons? Answer in units of mm / s. 004 10.0 points The drift velocity of free electrons in a cop- per wire is 7 mm / s, resistivity is 1 . 8 × 10 - 8 Ω · m, and the free electron density is 8 . 43 × 10 28 electrons / m 3 .

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Homework 9 - lim(kl9356 Homework 9 Weathers(22202 This...

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