20_InstSolManual_PDF_Part14

# 20_InstSolManual_PDF_Part14 - B 2 5 B 1 1 I 2 I 1 2 5 1 8.0...

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20.43. Set Up: For a long straight wire, Solve: 20.44. Set Up: Solve: 20.45. Set Up: Solve: (a) B as a function of r is sketched in Figure 20.45. Figure 20.45 (b) B is proportional to B approaches zero as r increases but becomes zero only at an infinite distance from the wire. Reflect: applies precisely only to an infinitely long straight wire. Any real wire is finite in length. But this expression is accurate for a wire of finite length at points much closer to the wire than their distance from the closest end of the wire. 20.46. Set Up: when Calculate when Solve: and 20.47. Set Up: when Solve: (a) and (b) (c) and Reflect: B is proportional to I and to When I is doubled, B is doubled. When r is doubled, B is halved. 20.48. Set Up: Solve: Assume that the lines are 10 m off the ground. At this distance This is about 4% of the earth’s magnetic field. The magnetic field is too small to be of concern. B 5 1 4 p3 10 2 7 T # m / A 21 100 A 2 2 p 1 10 m 2 5 2 3 10 2 6 T. m 0 5 4 p3 10 2 7 T # m / A. B 5 m 0 I 2 p r . 1 / r .
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Unformatted text preview: B 2 5 B 1 1 I 2 I 1 2 5 1 8.0 m T 2 1 2 I I 2 5 16.0 m T B 1 I 1 5 B 2 I 2 . B I 5 m 2 p r 5 constant r 2 5 r 1 1 B 1 B 2 2 5 1 2.0 cm 2 1 8.0 m T 1.0 m T 2 5 16.0 cm. B 2 5 B 1 1 r 1 r 2 2 5 1 8.0 m T 2 1 2.0 cm 4.0 cm 2 5 4.0 m T. B 1 r 1 5 B 2 r 2 . Br 5 m I 2 p 5 constant r 1 5 2.0 cm. B 1 5 8.0 m T B 5 m I 2 p r . r 2 5 r 1 1 B 1 B 2 2 5 R 1 B B / 3 2 5 3 R . B 1 r 1 5 B 2 r 2 . Br 5 m I 2 p 5 constant B 2 5 B / 3. r 2 r 1 5 R . B 1 5 B B 5 m I 2 p r . B 5 m I 2 p r 1 / r . B r B 5 m I 2 p r B 5 1 4 p 3 10 2 7 T # m / A 21 12 3 10 2 3 A 2 2 p 1 0.020 m 2 5 1.2 3 10 2 7 T 5 0.12 m T m 5 4 p 3 10 2 7 T # m / A. B 5 m I 2 p r . I 5 2 p rB m 5 2 p 1 0.050 m 21 1.0 3 10 2 10 T 2 4 p 3 10 2 7 T # m / A 5 2.5 3 10 2 5 A 5 25 m A. m 5 4 p 3 10 2 7 T # m / A. B 5 m I 2 p r . 1 gauss 5 10 2 4 T. 20-14 Chapter 20...
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## This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.

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