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HW__3_P2213_S09

# HW__3_P2213_S09 - Physics 2213 Read Homework#3 Spring 2009...

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Physics 2213 Homework #3 Spring 2009 Read: Chapter 22, section 22.5; Chapter 25, intro., sections 25.1, 2, 3 Chapter 23, intro., sections 23.1 (thru mid of p. 782), 23.2 (thru p. 791, incl. Ex. 23.3) Handouts: Conductors in Electrostatic Equilibrium ; Electric Current, Voltage, & Potential Learning Goals: (Be sure you understand where and how each goal in each assignment applies to our homework, discussion, lecture, and lab activities.) * Use Gauss' law along with basic mechanics and electrostatics principles to deduce the presence or absence of electric fields and electric charge in, on, or near conductors in electrostatic equilibrium. * Draw electric field lines in the vicinity of conductors in electrostatic equilibrium, and use the geometry of those lines to determine relative electric field strengths at different locations. * Use the Method of Image Charges to determine the magnitude and direction of the electric field due to electric charges near a conducting plane. * Use the relationships between electric charge and electric fields to explain and calculate the strengths of electric effects in physical phenomena discussed in lecture and your textbook. * Show how to determine voltage (electric potential difference) from electric field and vice- versa using line or path integrals or space derivatives along with equations or graphs. * Determine the electric current, current density, electric field, voltage, resistivity, drift velocity, or geometry in current-carrying conductors, given appropriate other quantities. * GENERAL SKILL: Conceptually translate an equation for electric field or potential difference as a function of position into a graph (without doing detailed numerical calculations). * GENERAL SKILL: Show that your algebraic and numerical results have the correct units. * GENERAL SKILL: Show that your algebraic and numerical results are physically reasonable. For extra practice: Chap. 22: Q's #Q22.10-12, 14-17; E's & P's #22.23, 31, 43, 46, 49 (not quizzed) Chap. 23: Q's #Q23.5, 8, 10, 12, 13, 17, 19, 20 Chap. 25: Q's #Q25.1-3, 9-13; E's & P's #25.3, 8, 17, 27 To be prepared for Wednesday-Friday, Feb. 11-13, at your 2nd weekly Discussion session: #Q23.7 [Closed Path Line Integral] #22.37 [Coaxial Cable] #22.47 [Concentric Spherical Shells] #22.51 [Conducting Plate] #25.61 [E-fields in a Wire] Please add: (e) What is the drift speed of the electrons in each segment of the wire if the mobile electron density in copper is 8.5 x 10 28 m -3 ? How much time would it take an electron to travel the length of each wire segment?

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