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Algebra Based Physics Magnetism 20160202 www.njctl.org Table of - PowerPoint PPT Presentation

Algebra Based Physics Magnetism 20160202 www.njctl.org Table of Contents Click on the topic to go to that section The Nature of Magnetism Magnetic Fields Origin and Direction of Magnetic Fields Magnetic Field & Force on


  1. Electric Currents Produce Magnetic Fields Here's how the magnetic field would look inside a current carrying loop. Your thumb points in the direction of the current, and your fingers curl around and show the magnetic field coming out of the board within the loop. Right­hand­rule: Right thumb points in the What direction is the magnetic field outside the loop? That's direction of the current right ­ into the board, as your Right fingers point in the fingers continue curling. direction of the magnetic field.

  2. 4 Which diagram shows the magnetic field (red) around a current carrying wire (blue?) x x x x x x x x x . . . . . . . . . . . B A x x x x x x x x x . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Answer . . . . . . . . . . . x x x x x x x x x C D . . . . . . . . . . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x https://www.njctl.org/video/?v=nMnjnjh2Fb8

  3. 5 Which diagram shows the magnetic field (red) around a current carrying wire (blue)? x x x x x x x x x B A x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Answer . . . . . . . . . . . . . . . . . . . . . . C D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . https://www.njctl.org/video/?v=WX­2wnm9bVs

  4. 6 Which diagram shows the magnetic field (black) around a current carrying wire (red)? C A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . D B x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . Answer

  5. 7 Which diagram shows the magnetic field inside and outside a current carrying loop of wire? B A x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . . . . x x x x x x . . . . . . x x x x x x x . . . . x x x x x x x x Answer x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x D C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x x . . . . . . . . . . . . . . . . . . . . . . . . . . x x x . . . . . . . . . . . . . . . . . . x x . . . . . . . . . . . . . . . . . . . . . . https://www.njctl.org/video/?v=A­Anx­M6r4U

  6. 8 Which diagram shows the magnetic field around a current carrying wire? B A Answer . . . . . . . . . . . . . . . . . . . . . . C . . . . . . . . . . . . . . . . . . . . . . D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . x x x x x x x x x https://www.njctl.org/video/?v=AKZgfaDIyXs

  7. 9 Which diagram shows the magnetic field around a current carrying wire? B A . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Answer . . . . . . . . . . . x x x x x x x x x C . . . . . . . . . . . D x x x x x x x x x . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . https://www.njctl.org/video/?v=epk5ptbYSpQ

  8. 10Which diagram shows the magnetic field inside and outside a current carrying loop of wire? . . . . . . . . . . . B A x x x x x x x x x . . . . . . . x x x x x x . . . . . . . . . x x . . . . . . x x x x . . . . . x x x . . . . x x x x . . . . . . . x x x x x x x x . . . . . . . . . . . x x x x x x x x x Answer . . . . . . . . . . . C x x x x x x x x x D . . . . . . . x x x x x x . . . . x x . . . . . x x x x . . . . . . x x x . . . . . x x x x . . . . . . . . . . . x x x x x x x x . . . . . . . . . . . x x x x x x x x x https://www.njctl.org/video/?v=l_JKvXis3Fs

  9. Answer 11Which diagram shows the magnetic field around a x x x x x x x x x . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D B current carrying wire? x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . . . . . . . . . . . x x x x x x x x x . . . . . . . . . . . https://www.njctl.org/video/?v=FnEyGxt1ImA C A

  10. Magnetic Field & Force on a Moving Charge Return to Table of Contents https://www.njctl.org/video/?v=P6w2kcjPuKY

  11. Magnetic Field & Force on a Moving Charge Magnetic fields are observed to exert a force on a moving charge but only if the charge is moving and the direction of its velocity is perpendicular to the direction of the magnetic field. The horseshoe magnet has a uniform magnetic field directed south, a positive charge is moving through it to N the left and a magnetic force is exerted perpendicular to both the B direction of the charge and the field. v F B S

  12. Magnetic Field & Force on a Moving Charge The direction of the force on a positive charge is perpendicular to both the charge's velocity N and the magnetic field. B The "right­arm­rule" is a handy v way to determine the direction of the magnetic force. F B S Using the right arm: arm points in the direction of the moving positive charge fingers point in the direction of the magnetic field thumb points in the direction of the magnetic force

  13. Force on a Moving Charge Here, we have the case of a negative charge and a positive charge moving to the right in a uniform magnetic field that is pointed out of the page. F B v (velocity) B v (velocity) F B

  14. Force on a Moving Charge F B v (velocity) B v (velocity) F B Notice, the force on the negative charge in the same field is acting in the opposite direction. Use the right­arm­rule to find the force on the positive charge. Use the same method for the negative charge, but then flip the direction of the resultant force, or use your left arm for negative charges.

  15. 12 What is the direction of the force on a proton moving to the right, with speed v, as shown below? v Answer D A B zero E C https://www.njctl.org/video/?v=MZmDiBwHvpE

  16. 13 What is the direction of the magnetic force on the proton below? A B v C Answer D E F Zero https://www.njctl.org/video/?v=NVNsELBbfhA

  17. 14 What is the direction of the magnetic force on the electron below? A v B C Answer D E F Zero https://www.njctl.org/video/?v=Q_2mbnfGLso

  18. 15 What is the direction of the magnetic force on the electron below? A B v C Answer D E F G Zero https://www.njctl.org/video/?v=RTgHrrppLGQ

  19. 16 What is the direction of the magnetic force on the electron below? A B C v Answer D E F G Zero https://www.njctl.org/video/?v=1pEI5pUwsZE

  20. 17 What is the direction of the magnetic force on the proton below? A B C Answer v D E F G Zero https://www.njctl.org/video/?v=nEJrijCT76Y

  21. Magnetic Field & Force on a Moving Charge When a charge enters a uniform magnetic field it experiences a force perpendicular to its velocity. As this force is exerted on the charge, what will be the direction of the charge's acceleration? v + F B v F B + F B F B v + + v

  22. Magnetic Field & Force on a Moving Charge Since the magnetic force is perpendicular to the charge's velocity, we have a "center seeking" force, which results in centripetal motion ­ the charge moves in a circle. An electron injected with velocity, v, into the magnetic field on the right will have a magnetic force directed to the right at all times (towards the middle of a circle). A positive particle will move in a counter clockwise path.

  23. Magnetic Field & Force on a Moving Charge Not only do magnetic poles exert a force on each other, but a magnetic field will exert a force on a moving charge. If the charge is not moving ­ it does not feel the force. This is a very unique concept and phenomenon in the universe. The force on a moving charge is related to the magnitude of its charge, velocity and strength of the magnetic field ­ but only the portion of the magnetic field that is perpendicular to the charge's motion. This will become clearer in AP Physics, but for now, here's the equation: F = qvB perpendicular

  24. 18 A proton moving at a speed of 75,000 m/s horizontally to the right enters a uniform magnetic field of 0.050 T which is directed vertically downward. Find the direction and magnitude of the magnetic force on the proton. Answer https://www.njctl.org/video/?v=cOiXV1p8j0M

  25. 19 An electron experiences an upward force of 2.8x10 ­12 N when it is moving at a speed of 5.1x10 6 m/s towards the north. What is the direction and magnitude of the magnetic field? Answer https://www.njctl.org/video/?v=­LqnDSpWfPA

  26. Magnetic Field & Force on a Current­Carrying Wire Return to Table of Contents https://www.njctl.org/video/?v=MPmTZZQCnWY

  27. Magnetic Field & Force on a Current­Carrying Wire ­ + I A magnet also exerts a force on a current­carrying wire, when current flow is perpendicular to the direction of the magnetic field. N The direction of the force can be B found using the right­arm­rule again, but this time place your arm in the direction of the conventional current. F B S

  28. Magnetic Field & Force on a Current­Carrying Wire ­ + I Current flows toward the left in the field, so right arm points left. The magnetic field points south, so N right fingers point south. B Right thumb points out of the page in the direction of the magnetic force. F B S

  29. 20 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A x x x x x x x x x B x x x x x x x x x x x x x x x x x x C Answer x x x x x x x x x D x x x x x x x x x x x x x x x x x x E F G zero https://www.njctl.org/video/?v=haThyJJ3wqU

  30. 21 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A . . . . . . . . . . . . . . . . . . . . . . B . . . . . . . . . . . C . . . . . . . . . . . Answer . . . . . . . . . . . D . . . . . . . . . . . E F G zero https://www.njctl.org/video/?v=GcKIjSHDqKE

  31. 22 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A x x x x x x x x x x x x x x x x x x B x x x x x x x x x x x x x x x x x x C Answer x x x x x x x x x D x x x x x x x x x E F G zero https://www.njctl.org/video/?v=pJeKIHqleNY

  32. 23 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A x x x x x x x x x B x x x x x x x x x x x x x x x x x x C Answer x x x x x x x x x D x x x x x x x x x x x x x x x x x x E F G zero https://www.njctl.org/video/?v=8887rBRtu9I

  33. 24 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A x x x x x x x x x B x x x x x x x x x x x x x x x x x x C Answer x x x x x x x x x D x x x x x x x x x x x x x x x x x x E F G zero https://www.njctl.org/video/?v=AX2qEWZQcpc

  34. 25 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A . . . . . . . . . . . B . . . . . . . . . . . . . . . . . . . . . . Answer C . . . . . . . . . . . D . . . . . . . . . . . . . . . . . . . . . . E F G zero

  35. 26 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A . . . . . . . . . . . B . . . . . . . . . . . Answer C . . . . . . . . . . . . . . . . . . . . . . D . . . . . . . . . . . E . . . . . . . . . . . F G zero

  36. 27 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer D E F G zero

  37. 28 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A . . . . . . . . . . . B . . . . . . . . . . . . . . . . . . . . . . C Answer . . . . . . . . . . . D . . . . . . . . . . . E . . . . . . . . . . . F G zero

  38. 29 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C D E F G zero

  39. 30 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C D E F G zero

  40. 31 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C D E F G zero

  41. 32 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C D E F G zero

  42. 33 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer D E F G zero

  43. 34 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C D E F G zero

  44. 35 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A . . . . . . . . . . . B . . . . . . . . . . . . . . . . . . . . . . C Answer . . . . . . . . . . . D . . . . . . . . . . . E . . . . . . . . . . . F G zero

  45. 36 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer D E F G zero

  46. 37 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A x x x x x x x x x B x x x x x x x x x x x x x x x x x x C Answer x x x x x x x x x D x x x x x x x x x x x x x x x x x x E F G zero

  47. 38 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer D E F G zero

  48. 39 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer G D E F G zero

  49. 40 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A . . . . . . . . . . . B . . . . . . . . . . . . . . . . . . . . . . C Answer G . . . . . . . . . . . D . . . . . . . . . . . E . . . . . . . . . . . F G zero

  50. 41 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C C D E F G zero

  51. 42 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer D D E F G zero

  52. 43 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C G D E F G zero

  53. 44 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C G D E F G zero

  54. 45 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C G D E F G zero

  55. 46 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C D D E F G zero

  56. 47 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B C Answer C D E F G zero

  57. 48 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer A C D E F G zero

  58. 49 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C E D E F G zero

  59. 50 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C F D E F G zero

  60. 51 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C B D E F G zero

  61. 52 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer F C D E F G zero

  62. 53 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C G D E F G zero

  63. 54 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C G D E F G zero

  64. 55 What is the direction of the magnetic force on the current carrying wire (green) in the magnetic field (red)? A B Answer C E D E F G zero

  65. Magnetic Field & Force on a Current­Carrying Wire The force on the wire depends on the current, the length of the wire, the magnetic field, and its orientation. F = ILB perpendicular I is the current L is the length of wire B is the magnetic field (perpendicular to both the force and current)

  66. 56 A 0.5 m long wire carries a current of 2.0 A in a direction perpendicular to a 0.3 T magnetic field. What is the magnitude of the magnetic force acting on the wire? Answer https://www.njctl.org/video/?v=iQFjAgXJHFY

  67. 57 A uniform magnetic field exerts a maximum force of 20 mN on a 0.25 m long wire carrying a current of 2.0 A. What is the strength of the magnetic field? Answer https://www.njctl.org/video/?v=RrssfOtHxrk

  68. 58 A 0.050N force acts on a 10.0 cm wire that is perpendicular to a 0.30 T magnetic field. What is the magnitude of the electric current through the wire? Answer

  69. Magnetic Field Due to a Long, Straight Current­Carrying Wire Return to Table of Contents https://www.njctl.org/video/?v=7400VR_lbz4

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