HW5c - GenericStudent Homework 5 savrasov 39823 Jan 02,...

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: GenericStudent Homework 5 savrasov 39823 Jan 02, 2008 1 This print-out should have 5 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 1) 2 points Calculate the average drift speed of electrons traveling through a copper wire with a cross- sectional area of 40 mm 2 when carrying a current of 5 A (values similar to those for the electric wire to your study lamp). Assume one electron per atom of copper contributes to the current. The atomic mass of copper is 63 . 5 g / mol and its density is 8 . 93 g / cm 3 . Avogadros number N A is 6 . 02 10 23 . Correct answer: 9 . 22817 10- 6 m / s. Explanation: Let : N = 1 , M = 63 . 5 g / mol , = 8 . 93 g / cm 3 , A = 40 mm 2 = 4 10- 5 m 2 , I = 5 A , and q e = 1 . 6 10- 19 C / electron . We first calculate n , the number of current- carrying electrons per unit volume in copper....
View Full Document

This note was uploaded on 01/10/2010 for the course PHY na taught by Professor Richardscalettar during the Winter '09 term at UC Davis.

Page1 / 2

HW5c - GenericStudent Homework 5 savrasov 39823 Jan 02,...

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