solutions 8 - Patel, Kinal Homework 8 Due: Feb 19 2008,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Patel, Kinal Homework 8 Due: Feb 19 2008, 7:00 pm Inst: Weathers 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 2) 10 points The quantity of charge passing through a sur- face of area 1 . 96 cm 2 varies with time as q = q 1 t 3 + q 2 t + q 3 , where q 1 = 4 . 7 C / s 3 , q 2 = 3 . 7 C / s, q 3 = 2 . 4 C, and t is in seconds. What is the instantaneous current through the surface at t = 0 . 8 s? Correct answer: 12 . 724 A. Explanation: Let : q 1 = 4 . 7 C / s 3 , q 2 = 3 . 7 C / s , q 3 = 2 . 4 C , and t = 0 . 8 s . I dq dt = 3 q 1 t 2 + q 2 = 3 ( 4 . 7 C / s 3 ) (0 . 8 s) 2 + 3 . 7 C / s = 12 . 724 A . 002 (part 2 of 2) 10 points What is the value of the current density at t = 0 . 8 s? Correct answer: 64918 . 4 A / m 2 . Explanation: Let : a = 1 . 96 cm 2 = 0 . 000196 m 2 and t = 0 . 8 s . J I A = 12 . 724 A . 000196 m 2 = 64918 . 4 A / m 2 . keywords: 003 (part 1 of 1) 10 points A conductor with cross-sectional area 7 cm 2 carries a current of 12 A. If the concentration of free electrons in the conductor is 9 10 28 electrons / m 3 , what is the drift velocity of the electrons? Correct answer: 0 . 00118886 mm / s....
View Full Document

This note was uploaded on 10/24/2010 for the course PHYS PHYS 2220 taught by Professor Weathers during the Spring '08 term at North Texas.

Page1 / 4

solutions 8 - Patel, Kinal Homework 8 Due: Feb 19 2008,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online