magnetism. magnetism –the ability of certain materials to attract iron, cobalt or nickel
TRANSCRIPT
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MAGNETISMMAGNETISM
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MAGNETISM –THE ABILITY OF CERTAIN MAGNETISM –THE ABILITY OF CERTAIN MATERIALS TO ATTRACT IRON, COBALT MATERIALS TO ATTRACT IRON, COBALT
OR NICKEL.OR NICKEL.
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CLASSIFICATION OF MAGNETSCLASSIFICATION OF MAGNETS
NATURAL MAGNETSNATURAL MAGNETS ARTIFICIAL PERMANENT MAGNETSARTIFICIAL PERMANENT MAGNETS ELECTROMAGNETELECTROMAGNET
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NATURAL MAGNET -EARTHNATURAL MAGNET -EARTH
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NATURAL MAGNETS--NATURAL MAGNETS--LODESTONESLODESTONES
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LODESTONES BECAME LODESTONES BECAME MAGNETIZED BY LYING IN MAGNETIZED BY LYING IN THE EARTH’S MAGNETIC THE EARTH’S MAGNETIC
FIELD FOR THOUSANDS OF FIELD FOR THOUSANDS OF YEARSYEARS
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THE ANCIENT GREEKS RECOGNIZED THE ANCIENT GREEKS RECOGNIZED THE MAGNETISM OF LODESTONES THE MAGNETISM OF LODESTONES
MORE THAN 2500 YEARS AGOMORE THAN 2500 YEARS AGO
THE SPHERE OF ARCHIMEDES
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ARTIFICIAL PERMANENT ARTIFICIAL PERMANENT MAGNETSMAGNETS
HARD STEEL HARD STEEL MAGNETIC COMPASSMAGNETIC COMPASS ALNICOALNICO
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HARD STEEL—HORSHOE HARD STEEL—HORSHOE MAGNETMAGNET
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MAGNETIC COMPASSMAGNETIC COMPASS
The magnetic compass was brought to Europe in the Middle Ages from the Chinese who had been using the compass for over 1500 years
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ALNICO—ALLOY OF: ALNICO—ALLOY OF:
AL—ALUMINIUMAL—ALUMINIUM
NI—NICKELNI—NICKEL
CO—COBALTCO—COBALT
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ALUMINUM CAN NOT BE ALUMINUM CAN NOT BE MAGNETIZEDMAGNETIZED
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ALNICO—SUPER STRONG ALNICO—SUPER STRONG MAGNETSMAGNETS
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ELECTROMAGNETS ELECTROMAGNETS TEMPORARY MAGNETS TEMPORARY MAGNETS
PRODUCED BY MEANS OF PRODUCED BY MEANS OF ELECTRIC CURRENT. ELECTRIC CURRENT.
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ELECTROMAGNETELECTROMAGNET
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MRI ELECTROMAGNETMRI ELECTROMAGNET
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LAWS OF MAGNETISMLAWS OF MAGNETISM
EVERY MAGNET HAS TWO POLES EVERY MAGNET HAS TWO POLES LIKE MAGNETIC POLES REPEL: LIKE MAGNETIC POLES REPEL:
UNLIKE POLES ATTRACTUNLIKE POLES ATTRACT THE FORCE OF ATTRACTION OR THE FORCE OF ATTRACTION OR
REPULSION FOLLOWS INVERSE REPULSION FOLLOWS INVERSE SQUARE LAW ( NOT ACCURATE)SQUARE LAW ( NOT ACCURATE)
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EVERY MAGNET HAS TWO EVERY MAGNET HAS TWO POLES-POLES-
NORTH & SOUTHNORTH & SOUTH
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LIKE MAGNETIC POLES REPELEACH LIKE MAGNETIC POLES REPELEACH OTHEROTHER
UNLIKE POLES ATTRACT EACH OTHERUNLIKE POLES ATTRACT EACH OTHER
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THE FORCE OF ATTRACTION THE FORCE OF ATTRACTION OR REPULSION BETWEEN OR REPULSION BETWEEN
TWO MAGNETSTWO MAGNETS
THE FORCE IS PROPORTIONAL TO THE THE FORCE IS PROPORTIONAL TO THE PRODUCT OF THE MAGNETIC POLE PRODUCT OF THE MAGNETIC POLE
STRENGTHS DIVIDED BY THE SQUARE STRENGTHS DIVIDED BY THE SQUARE OF THE DISTANCE BETWEEN THEM OF THE DISTANCE BETWEEN THEM
PpF = k
d2
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NATURE OF MAGNETISMNATURE OF MAGNETISM
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BREAKING A MAGNET WILL RESULT IN BREAKING A MAGNET WILL RESULT IN EACH FRAGMENT BECOMING A WHOLE EACH FRAGMENT BECOMING A WHOLE
MAGNETMAGNET
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HEATING OR HAMERING STEEL IN HEATING OR HAMERING STEEL IN PROXIMITY TO A MAGNET –WILL PROXIMITY TO A MAGNET –WILL MAGNETIZE IT.MAGNETIZE IT.
STROKING OF IRON WITH MAGNET STROKING OF IRON WITH MAGNET WILL MAGNETIZE ITWILL MAGNETIZE IT
GENTLY JARRING A TEST TUBE OF GENTLY JARRING A TEST TUBE OF IRON FILINGS NEAR A MAGNET WILL IRON FILINGS NEAR A MAGNET WILL MAGNETIZE ITMAGNETIZE IT
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MAGNETIZATIONMAGNETIZATION
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AN ELECTRIC CHARGE AN ELECTRIC CHARGE SPINNING ON ITS AXIS WILL SPINNING ON ITS AXIS WILL CREATE MAGNETIC FIELDCREATE MAGNETIC FIELD
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MOVING CHARGED PARTICLE MOVING CHARGED PARTICLE WILL INDUCE MAGNETIC WILL INDUCE MAGNETIC
FIELD FIELD
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THE SMALL MAGNET THE SMALL MAGNET CREATED BY ELECTRON CREATED BY ELECTRON
ORBIT IS CALLED A ORBIT IS CALLED A MAGNETIC DIPOLEMAGNETIC DIPOLE
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ACCUMULATION OF MANY ATOMIC ACCUMULATION OF MANY ATOMIC MAGNETS WITH THEIR DIPOLES MAGNETS WITH THEIR DIPOLES ALIGNED CREATES A MAGNETIC ALIGNED CREATES A MAGNETIC
DOMAINDOMAIN
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THE MAGNETIC DIPOLES IN THE MAGNETIC DIPOLES IN BAR MAGNET GENERATE BAR MAGNET GENERATE IMAGINARY LINES OF THE IMAGINARY LINES OF THE
MAGNETIC FIELDMAGNETIC FIELD
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MAGNETIC LINES OF FORCE MAGNETIC LINES OF FORCE ARE CLOSE LOOPSARE CLOSE LOOPS
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MAGNETIC LINES OF FORCEMAGNETIC LINES OF FORCEEARTHEARTH
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MAGNETIC LINES OF FORCEMAGNETIC LINES OF FORCEBAR MAGNETBAR MAGNET
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THE STRENGTH OF THE STRENGTH OF MAGNETIC FIELD IS MAGNETIC FIELD IS
EXPRESSED IN SI UNIT EXPRESSED IN SI UNIT TESLATESLA
1 TESLA = 10,000 GAUSSES
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MAGNETIC ELEMENT TWO MAGNETIC ELEMENT TWO OR MORE ELECTRONS OR MORE ELECTRONS SPINNING IN THE SAME SPINNING IN THE SAME
DIRECTIONDIRECTION
NUCLEUS
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A MAGNETIC ELEMENT CAN A MAGNETIC ELEMENT CAN EXISTS EITHER IN EXISTS EITHER IN
MAGNETIZED OR NON-MAGNETIZED OR NON-MAGNETIZED STATE MAGNETIZED STATE
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MAGNETIZED MAGNETIC MAGNETIZED MAGNETIC MATERIALMATERIAL
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NON-MAGNETIZED MAGNETIC NON-MAGNETIZED MAGNETIC MATERIALMATERIAL
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IN NONMAGNETIC MATERIALS JUST AS IN NONMAGNETIC MATERIALS JUST AS MANY ELECTRONS SPIN IN ONE MANY ELECTRONS SPIN IN ONE
DIRECTION AS IN OTHER.DIRECTION AS IN OTHER.THEIR OPPOSING MAGNETIC FIELDS THEIR OPPOSING MAGNETIC FIELDS
CANCEL OUTCANCEL OUT
NUCLEUS
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AURORA BOREALISAURORA BOREALIS
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CHARACTERISTICS OF THE CHARACTERISTICS OF THE LINES OF FORCELINES OF FORCE
FROM NORTH TO SOUTH OUSIDE THE FROM NORTH TO SOUTH OUSIDE THE MAGNET IN THE SPACEMAGNET IN THE SPACE
FROM SOUTH TO NORTH INSIDE THE FROM SOUTH TO NORTH INSIDE THE MAGNETMAGNET
IF IN THE SAME DIRECTION THEY WILL IF IN THE SAME DIRECTION THEY WILL REPELREPEL
MAGNETIC FIELD IS DISTORTED BY MAGNETIC FIELD IS DISTORTED BY MAGNETIC MATERIALS BUT NOT AFFECTED MAGNETIC MATERIALS BUT NOT AFFECTED BY NON-MAGNETIC MATERIALSBY NON-MAGNETIC MATERIALS
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LINES OF FORCELINES OF FORCE
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LINES OF FORCELINES OF FORCE
N S
N S
REPEL
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LINES OF FORCELINES OF FORCE
N S
S N
ATTRACT
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NONMAGNETIC MATERIALS DO NONMAGNETIC MATERIALS DO NOT AFFECT THE LINES OF NOT AFFECT THE LINES OF FORCE OF MAGNETIC FIELDFORCE OF MAGNETIC FIELD
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MAGNETIC MATERIALS LIKE MAGNETIC MATERIALS LIKE IRON AFFECT THE LINES OF IRON AFFECT THE LINES OF
FORCEFORCE
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MAGNETIC INDUCTION MAGNETIC INDUCTION (MAGNETIZATION)(MAGNETIZATION)
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MAGNETIZATION –DOMAINS MAGNETIZATION –DOMAINS MOVEMOVE
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MAGNETIC MAGNETIC PERMEABILITYPERMEABILITY
EASE WITH WHICH A GIVEN EASE WITH WHICH A GIVEN MATERIAL CAN BE MATERIAL CAN BE
MAGNETIZEDMAGNETIZED
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MAGNETIC MAGNETIC RETENTIVITYRETENTIVITY
MATERIAL RESISTANCE TO MATERIAL RESISTANCE TO MAGNETIZATIONMAGNETIZATION
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SOFT IRON HIGH SOFT IRON HIGH PERMEABILITY LOW PERMEABILITY LOW
RETENTIVITYRETENTIVITY
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HARD STEEL LOW HARD STEEL LOW PERMEABILITY HIGH PERMEABILITY HIGH
RETENTIVITYRETENTIVITY
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““EASY COME—EASY GO”EASY COME—EASY GO”
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MAGNETIC CLASSIFICATION OF MAGNETIC CLASSIFICATION OF MATTERMATTER
FERROMAGNETICFERROMAGNETIC
PARAMAGNETIC MATERIALSPARAMAGNETIC MATERIALS
NONMAGNETIC MATERIALSNONMAGNETIC MATERIALS
DIAMAGNETIC MATERIALSDIAMAGNETIC MATERIALS
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FERROMAGNETIC FERROMAGNETIC MATERIALS –IRON, MATERIALS –IRON, COBALT, NICKEL. COBALT, NICKEL.
STRONGLY ATTRACTED STRONGLY ATTRACTED BY MAGNETSBY MAGNETS
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PARAMAGNETIC PARAMAGNETIC MATERIALS—PLATINUM. MATERIALS—PLATINUM. FEEBLY ATTRACTED BY FEEBLY ATTRACTED BY
MAGNETSMAGNETS
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NONMAGNETIC NONMAGNETIC MATERIALS—COPPER, MATERIALS—COPPER,
WOOD, GLASS. THEY ARE WOOD, GLASS. THEY ARE NOT ATTRACTED TO NOT ATTRACTED TO
MAGNETS.MAGNETS.
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DIAMAGNETIC DIAMAGNETIC MATERIALS—BERYLLIUM MATERIALS—BERYLLIUM
& BISMUTH. FEEBLY & BISMUTH. FEEBLY REPELLED BY MAGNETSREPELLED BY MAGNETS
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DETECTION OF DETECTION OF MAGNETISM ---COMPASSMAGNETISM ---COMPASS
GEOGRAPHIC NORTH POLE IS GEOGRAPHIC NORTH POLE IS MAGNETIC SOUTH POLE?????MAGNETIC SOUTH POLE?????
S. GEOGRAPHIC
N. GEOGRAPHICS. MAGNETIC
N. MAGNETIC
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SMALL MAGNETSSMALL MAGNETS