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Magnetism

Magnetism. Observe:. N. S. N. S. Attract or repel?. Observe:. S. N. N. S. Attract or repel?. Observe:. N. S. S. N. Attract or repel?. Observe:. N. S. N. S. Attract or repel?. Observe:. N. S. Make a map of the magnetic field around the bar magnet. N. S.

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Magnetism

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  1. Magnetism

  2. Observe: N S N S Attract or repel?

  3. Observe: S N N S Attract or repel?

  4. Observe: N S S N Attract or repel?

  5. Observe: N S N S Attract or repel?

  6. Observe: N S

  7. Make a map of the magnetic field around the bar magnet N S

  8. Make a map of the magnetic field around the horseshoe magnet S N

  9. Try this.

  10. Try this. What does the current in the wire do?

  11. The magnetic field, B B S N

  12. A current makes a magnetic field I B

  13. A current makes a magnetic field I I B B • This is called the right hand rule

  14. Fields • If you put a ______ in a __________ field, it will experience a force.

  15. Fields • If you put a ______ in a __________ field, it will experience a force. • If you put a mass in a gravitational field, it will experience a force.

  16. Fields • If you put a ______ in a __________ field, it will experience a force. • If you put a mass in a gravitational field, it will experience a force. • If you put a charge in an electrical field, it will experience a force.

  17. Fields • If you put a ______ in a __________ field, it will experience a force. • If you put a mass in a gravitational field, it will experience a force. • If you put a charge in an electrical field, it will experience a force. • If you put a magnetin a magnetic field, it will experience a force.

  18. Oddly enough… Electrical and magnetic fields can attract and repel. Gravitational fields seem to only attract

  19. The relationship between electricity and magnetism A moving charge affects a magnet A moving magnet affects a charge

  20. The relationship between electricity and magnetism A moving charge affects a magnet … it makes a magnetic field A moving magnet affects a charge … it makes an electrical field

  21. The relationship between electricity and magnetism A moving charge affects a magnet … it makes a magnetic field A moving magnet affects a charge … it makes an electrical field • There is an application of the right hand rule for each of these

  22. The relationship between electricity and magnetism A stable magnetic field affects a charge… A stable electrical field affects a magnet…

  23. The relationship between electricity and magnetism A stable magnetic field affects a charge… … only if the charge is moving A stable electrical field affects a magnet… …only if the magnet is moving

  24. The relationship between electricity and magnetism A stable magnetic field affects a charge… … only if the charge is moving A stable electrical field affects a magnet… …only if the magnet is moving • There is an application of the right hand rule for each of these

  25. Electromagnets • A coil of wire, carrying a current makes a magnetic field. • If you put the coil around a piece of iron or steel, it becomes an electromagnet.

  26. Electromagnets • A coil of wire, carrying a current makes a magnetic field. • If you put the coil around a piece of iron or steel, it becomes an electromagnet. • Where could you use an electromagnet?

  27. Solenoid If a magnet can move into and out of the coil, it is called a solenoid.

  28. Solenoid If a magnet can move into and out of the coil, it is called a solenoid. • Where could you use a solenoid?

  29. Electric motors • An electric motor converts electrical energy into work, usually rotational motion. • Usually, a magnet makes coil of wire rotate when a current is flowing.

  30. Which direction is the force on the wire?

  31. Which direction is the force on the wire? • Use the right hand rule !

  32. B = the magnetic field =index finger • F = force on the wire =palm • I = the (+) current =thumb

  33. F = force on the wire =palm • I = the (+) current =thumb • B = the magnetic field =index finger

  34. What is the missing vector ? I B

  35. What is the missing vector ? I B

  36. Mechanical Energy Electrical Energy Motors --Convert electrical energy into mechanical energy --An electric current causes a coil of wire to spin in a magnetic field --The rotational motion can do many jobs

  37. Mechanical Energy Electrical Energy Generators --Convert mechanical energy into electrical energy --A coil of wire spinning in a magnetic field causes an electric current --There are many ways to spin the generator

  38. Mechanical Energy Electrical Energy Motors --Convert electrical energy into mechanical energy --An electric current causes a coil of wire to spin in a magnetic field --The rotational motion can do many jobs Generators --Convert mechanical energy into electrical energy --A coil of wire spinning in a magnetic field causes an electric current --There are many ways to spin the generator

  39. 1 2 3 4 5 6

  40. Mechanical Energy Electrical Energy Generator: If you move the wire, the force is exerted on the charge Motor: If you move the charge (a current), the force is exerted on the wire • I • B • B • EMF • Force

  41. B = the magnetic field =index finger • EMF = force on the charge • =palm • v = velocity of moving wire =thumb

  42. What is the missing vector ? v B

  43. What is the missing vector ? v B

  44. What is the missing vector ? EMF v

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