# HW3 - Physics 122 Spring 2009 Document#07 Homework#03 page...

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Physics 122 Spring 2009 – Document #07: Homework #03 page 1 of 9 PHYS 122: Homework #03 January 26, 2009 Homework #03 is due in Box outside of Rock 207: 5:00 PM Sharp, Monday, February 2, 2009 Announcements: Mr. Covault’s Office Hours will generally be Mondays: 11 AM to noon and 1:30 PM to 4:00 PM, Thursdays: 1:15 PM to 2:30 PM and 3 PM to 4 PM, and Fridays: 10:45 AM to 12:15 PM. First Hour Exam (worth five percent of your grade) will be given Friday, February 6, 9:30 AM in lecture. The exam is closed book, no books or notes – but you may bring one 8 1 2 × 11 sheet of paper (front and back) with any hand-written notes that you like. Simple calculators are okay – no programmable calculators, PDA’s, phones, Blackberries, etc. Details will be announced in Document #08. Homework #01 is being graded and I expect it will be available to students sometime after Tuesday or Wednesday of this week. It usually takes about a week to get the homework graded. Solutions to Homework #01 are posted. Solutions to Homework #02 will be posted before Wednesday morning. Don’t forget: Odd labs this week. Homework Assignment continues next page ....

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Physics 122 Spring 2009 – Document #07: Homework #03 page 2 of 9 This homework due in Box outside of Rock 207: 5:00 PM Sharp, Monday, February 2, 2009 Problem 1: This from the 2007 First Hour Exam: d d -2σ 0 d P P d z x Ι 0 Ι 0 0 0 -2σ 0 Side View d z x y d Perspective View The above plot shows an arrangement of two infinite charged plates. The upper plate has positive surface charge density + σ 0 and the lower plate has negative surface charge density - 2 σ 0 . The separation between the plates is 2 d . Also, at a distance d above the upper plate is an infinite wire carrying a current I 0 in the x-direction as shown. a) Consider the point P which is located half-way between the plates. What is the electric field at point P ? Write down your answer as a vector using the coordinate system shown: x points right, y points back (into page) and z points up. Be sure to explain how you determined your answer. b) What is the magnetic field at point P ? Write down your answer as a vector using the coordinate system shown. Be sure to explain your work. c) Now particle with positive charge q 0 is placed at point P and is given an initial velocity vectorv = v 0 ˆ ı . What is the value of the speed v 0 that will allow the particle to move in a straight line without being deflected in any direction? Here ignore gravity!
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