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Electromagnetism

Chapter 22. Electromagnetism. contents. Force on a current-carrying conductor Force on beam of charged particles Fleming’s Left-hand rule Turning effect of a current-carrying coil in a magnetic field The D.C. Motor Chapter Review. Force on a current-carrying conductor.

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Electromagnetism

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  1. Chapter 22 Electromagnetism

  2. contents Force on a current-carrying conductor Force on beam of charged particles Fleming’s Left-hand rule Turning effect of a current-carrying coil in a magnetic field The D.C. Motor Chapter Review

  3. Force on a current-carrying conductor Apparatus to demonstrates force on a current-current conductor in an external magnetic field

  4. Force on a current-carrying conductor After Switch ON Before Switch ON

  5. Force on a current-carrying conductor After Switch ON Before Switch ON

  6. Force on a current-carrying conductor ▪ Current-carrying conductor placed in a magnetic field will experience a force (known as Lorentz force) (Note: Current is not parallel to magnetic field) F = BILsin θ F: Lorentz Force on current- carrying conductor B: Magnetic Field Stength I: Current in conductor L: Length of conductor Θ: Angle between B & I

  7. Action = Force B= Magnetic Field C= Current Fleming’s Left-hand rule ▪ Fleming’s left-hand rule is used to find the directions of force, magnetic field and conventional current when any of the other two quantities are known

  8. Force on a current-carrying conductor Example: Current DOWN Current UP Current OFF

  9. Force on a current-carrying conductor Example:

  10. Force on a current-carrying conductor

  11. Force on a current-carrying conductor Application: Moving Coil loudspeaker

  12. Force on beam of charged particles Positive Charged Particles

  13. Force on beam of charged particles Negative Charged Particles F V

  14. Force on beam of charged particles

  15. Force on beam of charged particles

  16. Force on beam of charged particles • Used in Cathode Ray tube for • TV screen • computer monitors • Oscilloscope to • study waveforms

  17. Force on beam of charged particles F = qvBsin θ F: Force on charged particls B: Magnetic Field Stength q: Charge of the particles (Charge of 1 proton = 1.6 x 10-19C) (Charge of 1 electron = -1.6 x 10-19C) v: velocity of the charged particles Θ: Angle between B & charged particles

  18. Turning Effect of a current-carrying coil in a magnetic field Carbon Brushes Commutator

  19. Turning Effect of a current-carrying coil in a magnetic field • Purpose of the commutator: • To reverse the direction of the current in the loop whenever • the commutator changes contact from one brush to the other • This ensures that the loop will always be turning in one • direction

  20. Turning Effect of a current-carrying coil in a magnetic field

  21. Turning Effect of a current-carrying coil in a magnetic field

  22. Turning Effect of a current-carrying coil in a magnetic field

  23. Turning Effect of a current-carrying coil in a magnetic field • The current-carrying coil in a magnetic • field on the whole experiences a turning • effect • Turning force (or turning effect) can be • increased by either (or both): • - increasing the number of turns on the coil • - increasing the current in the coil • - place a soft-iron core within the field Application: Electric Motors like electric fans, hair dryers

  24. Turning Effect of a current-carrying coil in a magnetic field

  25. Turning Effect of a current-carrying coil in a magnetic field

  26. Turning Effect of a current-carrying coil in a magnetic field

  27. Turning Effect of a current-carrying coil in a magnetic field

  28. Force between two parallel Current-Carrying Wires Unlike currents repel

  29. Force between two parallel Current-Carrying Wires Like currents attract

  30. A Cyclotron – Charged Particles Accelerator

  31. A Cyclotron – Charged Particles Accelerator

  32. A Cyclotron – Charged Particles Accelerator

  33. A Cyclotron – Charged Particles Accelerator

  34. A Cyclotron – Charged Particles Accelerator

  35. A Cyclotron – Charged Particles Accelerator

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