10 R (8) pat *59. (II) cro and Path 2 tic Path 1 (b) mi (a) *60. (II dit FIGURE 20-60 Problem 49. (a) A toroid or torus. (b) A section of the toroid showing direction of the current for three loops: O means current toward you, and means current away from you. su ra if 50. (III) (a) Use Ampère's law to show that the magnetic field between the conductors of a coaxial cable (Fig. 20-61) is B = µoI/2™r if r (distance from center) is greater than the radius of the inner wire and less than the radius of the outer cylindrical braid (= ground). (b) Show B = 0 outside the *20-1 %3D *61. ( Insulating sleeve that %3D coaxial cable. *62. FIGURE 20-61 Cylindrical braid Coaxial cable. Solid wire Problem 50. *63. 20-9 and 20-10 Torque on Current Loop, Motors, Galvanometers Bol 51. (I) A single square loop of wire 22.0 cm on a side is placed with its face parallel to the magnetic field as in Fig. 20-34b. When 5.70 A flows in the coil, the torque on it is 0.325 m· N. What is the magnetic field strength? 52. (I) If the current to a motor drops by 12%, by what factor does the output torque change? B(T Bol BC 586 CHAPTER 20 Magnetism

10 R (8) pat 59. (II) cro and Path 2 tic Path 1 (b) mi (a) 60. (II dit FIGURE 20-60 Problem 49. (a) A toroid or torus. (b) A section of the toroid showing direction of the current for three loops: O means current toward you, and means current away from you. su ra if 50. (III) (a) Use Ampère's law to show that the magnetic field between the conductors of a coaxial cable (Fig. 20-61) is B = µoI/2™r if r (distance from center) is greater than the radius of the inner wire and less than the radius of the outer cylindrical braid (= ground). (b) Show B = 0 outside the 20-1 %3D 61. ( Insulating sleeve that %3D coaxial cable. 62. FIGURE 20-61 Cylindrical braid Coaxial cable. Solid wire Problem 50. 63. 20-9 and 20-10 Torque on Current Loop, Motors, Galvanometers Bol 51. (I) A single square loop of wire 22.0 cm on a side is placed with its face parallel to the magnetic field as in Fig. 20-34b. When 5.70 A flows in the coil, the torque on it is 0.325 m· N. What is the magnetic field strength? 52. (I) If the current to a motor drops by 12%, by what factor does the output torque change? B(T Bol BC 586 CHAPTER 20 Magnetism

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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