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Electro-Magnetism

Electro-Magnetism. © David Hoult 2009. Magnetic Field Shapes. © David Hoult 2009. Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux. © David Hoult 2009.

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Electro-Magnetism

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  1. Electro-Magnetism © David Hoult 2009

  2. Magnetic Field Shapes © David Hoult 2009

  3. Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux © David Hoult 2009

  4. Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux These lines show the direction of the force which would act on a free north magnetic pole placed in the field © David Hoult 2009

  5. Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux These lines show the direction of the force which would act on a free north magnetic pole placed in the field However, since free north magnetic poles don’t exist... think of the lines as showing which way a very small compass would point if placed in the field © David Hoult 2009

  6. Magnetic fields are represented by lines called lines of magnetic force or lines of magnetic flux These lines show the direction of the force which would act on a free north magnetic pole placed in the field However, since free north magnetic poles don’t exist... think of the lines as showing which way a very small compass would point if placed n the field The “density” of lines on a diagram indicates the strength of the magnetic field © David Hoult 2009

  7. Field due to a straight current-carrying conductor © David Hoult 2009

  8. Field due to a straight current-carrying conductor © David Hoult 2009

  9. It is found that a compass always points perpendicular to the conductor so we conclude that the lines form circles (or cylinders) round the conductor © David Hoult 2009

  10. To remember the sense of the magnetic field, think about © David Hoult 2009

  11. To remember the sense of the magnetic field, think about opening a bottle of wine. © David Hoult 2009

  12. To remember the sense of the magnetic field, think about opening a bottle of wine. © David Hoult 2009

  13. To remember the sense of the magnetic field, think about opening a bottle of wine. demo... © David Hoult 2009

  14. To remember the sense of the magnetic field, think about opening a bottle of wine. © David Hoult 2009

  15. Field due to a short current-carrying coil of wire © David Hoult 2009

  16. Field due to a short current-carrying coil of wire © David Hoult 2009

  17. Field due to a short current-carrying coil of wire © David Hoult 2009

  18. Field due to a long current-carrying coil of wire (also called a solenoid) © David Hoult 2009

  19. Field due to a long current-carrying coil of wire (also called a solenoid) © David Hoult 2009

  20. Field due to a long current-carrying coil of wire (also called a solenoid) © David Hoult 2009

  21. This field is similar to that of a bar magnet © David Hoult 2009

  22. This field is similar to that of a bar magnet © David Hoult 2009

  23. This field is similar to that of a bar magnet © David Hoult 2009

  24. This field is similar to that of a bar magnet © David Hoult 2009

  25. This field is similar to that of a bar magnet © David Hoult 2009

  26. Current into plane of diagram © David Hoult 2009

  27. Current into plane of diagram Current out of plane of diagram © David Hoult 2009

  28. Fields due to two parallel current-carrying conductors © David Hoult 2009

  29. Fields due to two parallel current-carrying conductors Currents flowing in the same sense © David Hoult 2009

  30. Fields due to two parallel current-carrying conductors Currents flowing in the same sense © David Hoult 2009

  31. Fields due to two parallel current-carrying conductors Currents flowing in the same sense © David Hoult 2009

  32. Fields due to two parallel current-carrying conductors Currents flowing in the same sense © David Hoult 2009

  33. Fields due to two parallel current-carrying conductors Currents flowing in the same sense © David Hoult 2009

  34. Fields due to two parallel current-carrying conductors Currents flowing in the same sense The two conductors attract each other © David Hoult 2009

  35. Currents flowing in opposite sense © David Hoult 2009

  36. Close to the conductors the field is very nearly circular © David Hoult 2009

  37. © David Hoult 2009

  38. The field is similar in shape to the field of a © David Hoult 2009

  39. The field is similar in shape to the field of a short coil © David Hoult 2009

  40. The field is similar in shape to the field of a short coil The two conductors repel each other © David Hoult 2009

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