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Unformatted text preview: 59a CHAPTER 22 ELECTRIC FIELDS tered on the same line. For three situations, the uniform charges on rings A and B are. respectively, (1) q6 and qo, (2) q6 and  c10, and (3)  qs and q6. Rank the situations according to the magni tude of the net electric field at (a) point p, midway between the rings. (b) point P, at the center of ring B, and (c) point p. to the right of ring B, greatest first. 7 The potential energies associated with four orientations of an electric dipole in an elecrric field are (l) 5LJr,(2) jLI0,(3) 3Uu, and (4) 5us, where u6 is positive. Rank the orientations according to (a) the angle between the electric dipole moment I and the electric fleld E and (b) the magnitucle of the torque on the electric dipole, greatest first. 8 (a) In the checkpoint of Section 229, ifthe dipole rotates from orientation 1 to orientation 2. is the work done on the dipole by the field positive. negative. or zero? (b) It instead, the dipole rotates from orientation 1 to orientation 4, is the work done by the field more than,less than, or the same as in (a)? 9 Figure 2226 shows two disks and a flat ring, each with the same uniform charge Q. Rank the objects according to the magnitude of the electric field they create at points p (which are at the same ver tical heights), greatesr first. \a) (.b) ( r) Fig.2226 Question 9. 10 In Fig. 2221 , an electron e travels through a small hole in plate A and then toward plate B. A uniform electric field in the re gion between the plates then slows the electron without deflectins it. (a) What is the direction of the field? (lb) Four other parricles simi p larly triavel through small holes in either ytlate A or plate B and then +Qt into the region between the plates. Three have charges +q1. tc1t. and, nqy T)te fourth (labeled n) is a1 B 2 2  2 7 Question 10. neutrorL, which is electrically neu Fig. tral. Dr:es the speed of each of those four other particles increase, decrease, or remain the same in the region between the plates? 11 In Fig. 2228a, a circular plastic rod with uniform charge + Q produces an electric field of magnitude E at the center of curvature (at the origin). In Figs.222Bb,c, and d, more circular rods, each with identical uniform charges *e,are added until the circle is complete. A fifth arrangement (rvhich would be labelecl e) is like that in d except the rod in the fourth quadrant has charge Q. Rank the five arrangements according to the magnitude of the electric field at the center of curvature, greatest first. Fig.222A Question 11. S Tutoring problem available (at instructor's discretion) in WteyPLtJSand WebAssign SSM Workedout solution available in Student Solutions Manual WWW Workedout solution is at ....
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This document was uploaded on 10/25/2010.
 Fall '09

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