Chapter 31-College Physics 7^th ed. (Sears, Zemansky, Young)

31-1. a) 2.4 x 10^-5 T b) yes

31-2. a) 1.44 x 10^-7 T b) 4.80 x 10^-8 T

31-3. a) 100 A b) 2.00 x 10^-4 T; 1.00 x 10^-4 T

31-4. a) 4 x 10^-6 T; -y direction b) 4 x 10^-6 T; +x direction c) 2 x 10^-6 T; -x direction

31-5. a) m₀I/Õa b) m₀I/3Õa c) 0 d) 2m₀I/3Õa

31-6. a) 2.50 x 10^-6 N; repulsive b) 1.00 x 10^-5 N

31-7. a) 10.0A b) Opposite

31-8. ?

31-9. 3.67 mm

31-10. 7.54 x 10^-4 T

31-11. 12 turns

31-12. 0.0120 T

31-13. ?

31-14. a) 0 b) 6.25 x 10^-4 T c) 0

31-15. a) 7200 turns b) 1.13 x 10³ m

31-16. 5.00 x 10^-4 T

31-17. ?

31-18. a) 0 b) 1.40 x 10^-6 T; -z direction c) 1.40 x 10^-6 T; -y direction

d) 1.40 x 10^-6 T; +y direction

31-19. 1.1 x 10^-6 T; -z direction

31-20. a: 2.00 x 10^-5T; b: 7.07 x 10^-6 T; c: 2.00 x 10^-5 T; d: 0; e: 5.44 x 10^-6 T

31-21. 6.74 x 10^-5 T

31-22. m₀I/4R; into plane of figure

31-23. see back of book

31-24. 22.3 A

31-25. a) m₀I/2Õr b) 0

31-26. ?

31-27. m₀I/2Õr b) m₀(I₁ – I₂)/2Õr

31-28. 0.600 T; 99.8%

31-29. ?

31-30. a) 0.0339 A b) 0.00914 A

31-31. see back of book

31-32. ?

31-33. a) 1.08 x 10^-4 N/m; -y direction b) 1.08 x 10^-4 N/m; +y direction

31-34. a) 2.00 A; out of place b) 2.13 x 10^-6 T; to the right c) 2.06 x 10^-6 T

31-35. 2.88 x 10^-4 N; toward the wire

31-36. 4.00 x 10^-20 N; away from the wire

31-37. 35.9 A

31-38. a) 0 b) 1.13 x 10^-6T; in xy plane, midway between +x and +z axis c) 1.6 x 10^-6T; +x direct.

31-39. see back of book

31-40. m₀I(b – a)/4ab; out of plane of figure

31-41. a) 560 b) 559

31-42. a) 0

31-43. see back of book

31-44. ?

31-45. see back of book