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Magnetism PowerPoint Presentation

Magnetism

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Magnetism

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  1. Magnetism Magnetic field- A magnet creates a magnetic field in its vicinity.

  2. Magnetism It represents the effect a magnet has on its surroundings.

  3. Magnetism All magnetic fields arise from the motion of electric charge.

  4. Magnetism Magnetic field lines can be used to represent magnetic fields. The closer the lines are together, the greater the magnitude of the vector

  5. Figure 22-4 Magnetic Field Lines for a Bar Magnet

  6. Magnetism A magnetic field is represented by the symbol

  7. Magnetism The direction of a magnetic field at a given location is the direction in which the north pole of a compass points when it is placed in that location.

  8. Magnetism A charged particle moving in a magnetic field will experience a force if it has a velocity component perpendicular to the magnetic field.

  9. Magnetism

  10. Magnetism The Magnetic Force Right Hand Rule (RHR)

  11. Magnetism

  12. Figure 22-8The Magnetic Force Right-Hand Rule

  13. Figure 22-9The Magnetic Force for Positive and Negative Charges

  14. Conceptual Checkpoint 22-2Which is the positive? Negative? Zero charge?

  15. Magnetism Velocity selector. A device with both magnetic and electric fields present. Only charged particles moving with a certain speed will pass through undeflected.

  16. Magnetism

  17. Conceptual Checkpoint 22-3Which direction should the magnetic field be to give zero force?

  18. Magnetism A charged particle moving with a velocity perpendicular to a uniform magnetic field, will move in a circle.

  19. Figure 22-11The Electromagnetic Flowmeter

  20. Magnetism

  21. Magnetism

  22. Magnetism

  23. Figure 22-12Circular Motion in a Magnetic Field

  24. Example 22-3Uranium Separation

  25. Magnetism • Forces on a long straight current carrying wire in a magnetic field.

  26. Magnetism • Forces on a long straight current carrying wire in a magnetic field.

  27. Magnetism • A long straight current carrying wire has charges moving inside it.

  28. Magnetism • If it is placed in a magnetic field, it will experience a force

  29. Magnetism

  30. Magnetism

  31. Figure 22-15The Magnetic Force on a Current-Carrying Wire

  32. Magnetism • Direction of magnetic forces in a current carrying loop in a magnetic field.

  33. Figure 22-16Magnetic Forces on a Current Loop

  34. Example 22-5Torque on a Coil

  35. Magnetism

  36. Magnetism

  37. Magnetism • To calculate the magnitude and direction of the magnetic field in the vicinity of a long straight current carrying wire.

  38. Magnetism • Apply the magnetic field right hand rule. • Point your thumb in the direction of current flow. • Curl your fingers around the wire • They will point in the direction of the magnetic field.

  39. Figure 22-19The Magnetic Field of a Current-Carrying Wire

  40. Magnetism

  41. Magnetism