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MAGNETISM

MAGNETISM. MAGNETISM –THE ABILITY OF CERTAIN MATERIALS TO ATTRACT IRON, COBALT OR NICKEL. CLASSIFICATION OF MAGNETS. NATURAL MAGNETS ARTIFICIAL PERMANENT MAGNETS ELECTROMAGNET. NATURAL MAGNET -EARTH. NATURAL MAGNETS--LODESTONES.

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MAGNETISM

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  1. MAGNETISM

  2. MAGNETISM –THE ABILITY OF CERTAIN MATERIALS TO ATTRACT IRON, COBALT OR NICKEL.

  3. CLASSIFICATION OF MAGNETS • NATURAL MAGNETS • ARTIFICIAL PERMANENT MAGNETS • ELECTROMAGNET

  4. NATURAL MAGNET -EARTH

  5. NATURAL MAGNETS--LODESTONES

  6. LODESTONES BECAME MAGNETIZED BY LYING IN THE EARTH’S MAGNETIC FIELD FOR THOUSANDS OF YEARS

  7. THE ANCIENT GREEKS RECOGNIZED THE MAGNETISM OF LODESTONES MORE THAN 2500 YEARS AGO THE SPHERE OF ARCHIMEDES

  8. ARTIFICIAL PERMANENT MAGNETS • HARD STEEL • MAGNETIC COMPASS • ALNICO

  9. HARD STEEL—HORSHOE MAGNET

  10. The magnetic compass was brought to Europe in the Middle Ages from the Chinese who had been using the compass for over 1500 years MAGNETIC COMPASS

  11. ALNICO—ALLOY OF: • AL—ALUMINIUM • NI—NICKEL • CO—COBALT

  12. ALUMINUM CAN NOT BE MAGNETIZED

  13. ALNICO—SUPER STRONG MAGNETS

  14. ELECTROMAGNETS TEMPORARY MAGNETS PRODUCED BY MEANS OF ELECTRIC CURRENT.

  15. ELECTROMAGNET

  16. MRI ELECTROMAGNET

  17. LAWS OF MAGNETISM • EVERY MAGNET HAS TWO POLES • LIKE MAGNETIC POLES REPEL: UNLIKE POLES ATTRACT • THE FORCE OF ATTRACTION OR REPULSION FOLLOWS INVERSE SQUARE LAW ( NOT ACCURATE)

  18. EVERY MAGNET HAS TWO POLES-NORTH & SOUTH

  19. LIKE MAGNETIC POLES REPELEACH OTHERUNLIKE POLES ATTRACT EACH OTHER

  20. THE FORCE OF ATTRACTION OR REPULSION BETWEEN TWO MAGNETS Pp F = k d2 THE FORCE IS PROPORTIONAL TO THE PRODUCT OF THE MAGNETIC POLE STRENGTHS DIVIDED BY THE SQUARE OF THE DISTANCE BETWEEN THEM

  21. NATURE OF MAGNETISM

  22. BREAKING A MAGNET WILL RESULT IN EACH FRAGMENT BECOMING A WHOLE MAGNET

  23. HEATING OR HAMERING STEEL IN PROXIMITY TO A MAGNET –WILL MAGNETIZE IT. • STROKING OF IRON WITH MAGNET WILL MAGNETIZE IT • GENTLY JARRING A TEST TUBE OF IRON FILINGS NEAR A MAGNET WILL MAGNETIZE IT

  24. MAGNETIZATION

  25. AN ELECTRIC CHARGE SPINNING ON ITS AXIS WILL CREATE MAGNETIC FIELD

  26. MOVING CHARGED PARTICLE WILL INDUCE MAGNETIC FIELD

  27. THE SMALL MAGNET CREATED BY ELECTRON ORBIT IS CALLED A MAGNETIC DIPOLE

  28. ACCUMULATION OF MANY ATOMIC MAGNETS WITH THEIR DIPOLES ALIGNED CREATES A MAGNETIC DOMAIN

  29. THE MAGNETIC DIPOLES IN BAR MAGNET GENERATE IMAGINARY LINES OF THE MAGNETIC FIELD

  30. MAGNETIC LINES OF FORCE ARE CLOSE LOOPS

  31. MAGNETIC LINES OF FORCEEARTH

  32. MAGNETIC LINES OF FORCEBAR MAGNET

  33. THE STRENGTH OF MAGNETIC FIELD IS EXPRESSED IN SI UNIT TESLA 1 TESLA = 10,000 GAUSSES

  34. MAGNETIC ELEMENT TWO OR MORE ELECTRONS SPINNING IN THE SAME DIRECTION NUCLEUS

  35. A MAGNETIC ELEMENT CAN EXISTS EITHER IN MAGNETIZED OR NON-MAGNETIZED STATE

  36. MAGNETIZED MAGNETIC MATERIAL

  37. NON-MAGNETIZED MAGNETIC MATERIAL

  38. IN NONMAGNETIC MATERIALS JUST AS MANY ELECTRONS SPIN IN ONE DIRECTION AS IN OTHER.THEIR OPPOSING MAGNETIC FIELDS CANCEL OUT NUCLEUS

  39. AURORA BOREALIS

  40. CHARACTERISTICS OF THE LINES OF FORCE • FROM NORTH TO SOUTH OUSIDE THE MAGNET IN THE SPACE • FROM SOUTH TO NORTH INSIDE THE MAGNET • IF IN THE SAME DIRECTION THEY WILL REPEL • MAGNETIC FIELD IS DISTORTED BY MAGNETIC MATERIALS BUT NOT AFFECTED BY NON-MAGNETIC MATERIALS

  41. LINES OF FORCE

  42. LINES OF FORCE REPEL N S N S

  43. LINES OF FORCE ATTRACT S N N S

  44. NONMAGNETIC MATERIALS DO NOT AFFECT THE LINES OF FORCE OF MAGNETIC FIELD

  45. MAGNETIC MATERIALS LIKE IRON AFFECT THE LINES OF FORCE

  46. MAGNETIC INDUCTION (MAGNETIZATION)

  47. MAGNETIZATION –DOMAINS MOVE

  48. MAGNETIC PERMEABILITY EASE WITH WHICH A GIVEN MATERIAL CAN BE MAGNETIZED

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