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MAGNETISM

MAGNETISM. MAGNETISM IS PRODUCED BY MOVING CHARGES. MAGNETISM. CAUTION STRONG MAGNETS CAN DAMAGE MAGNETIC DEVICES. ACTIVITY. TO WHAT WILL A MAGNET STICK MIGHTY MAGNET MAGNETIC MINING SWEET TOOTH MAGNETS. ACTIVITY. MAGNETIC COMPASS MAGIC FACE TO FACE. MAGNETIC POLES.

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MAGNETISM

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  1. MAGNETISM MAGNETISM IS PRODUCED BY MOVING CHARGES.

  2. MAGNETISM CAUTION STRONG MAGNETS CAN DAMAGE MAGNETIC DEVICES.

  3. ACTIVITY • TO WHAT WILL A MAGNET STICK • MIGHTY MAGNET • MAGNETIC MINING • SWEET TOOTH MAGNETS

  4. ACTIVITY MAGNETIC COMPASS MAGIC FACE TO FACE

  5. MAGNETIC POLES THE “N” POLE OF A MAGNET MEANS THAT THIS POLE SEEKS THE NORTH POLE OF THE EARTH, IF THE MAGNET IS FREE TO ALLIGN ITSELF WITH THE EARTH’S MAGNETIC FIELD.

  6. LAWS OF ATTRACTION LIKE POLES REPEL UNLIKE POLES ATTRACT N S S N N S N S

  7. MAGNETIC POLES • A MAGNET IS A DIPOLE (TWO POLE). • THERE IS NO MONOPOLE (SINGLE POLE). • CUT A MAGNET IN HALF AND YOU GET TWO DIPOLES. N S N S N S

  8. MAGNETIC MATERIALS • MOST MATERIALS ARE NOT MAGNETIC • NATURALLY OCURRING MAGNETIC MATERIALS ARE CALLED FERROMAGNETIC (IRON-LIKE) • FERROMAGNETIC MATERIALS ARE • IRON • COBALT • NICKLE

  9. Lodestone • A Lodestone is a naturally occurring piece of magnetic iron oxide. It is often bound in a brass frame, and is oriented to place the magnetic poles at the ends. • The word magnet comes from the region called Magnesia in Asia Minor. The word lodestone comes from the use of pieces of ore from Norway and Sweden which were suspended and used as guiding or leading stone; the Saxon word Læden means "to lead".

  10. FERROMAGNETISM • ELECTRONS HAVE MAGNETIC FIELDS DUE TO THEIR SPIN AND ORBITAL MOTION. • ATOMS OF FERROMAGNETIC MATERIALS POSSESS ELECTRONS WHICH HAVE MAGNETICS FIELDS THAT DO NOT CANCEL OUT INSIDE THE ATOM. • DEMO

  11. MAGNETIC DOMAINS THESE ARE SMALL REGIONS IN A FERROMAGNETIC MATERIAL WHERE ALL THE MAGNETIC FIELDS OF THE ATOMS ARE ALIGNED.

  12. MAGNETIZATION IF THE DOMAINS ARE ALIGNED, THE MATERIAL IS POLARIZED AND BECOMES MAGNETIZED N S

  13. MAKING A MAGNET A PIECE OF SOFT IRON CAN BE MAGNETIZED BY RUBBING ONE END WITH ONE POLE OF A STRONG MAGNET.

  14. ACTIVITY WATER COMPASS

  15. MAGNETIC FIELD • IMAGINARY LINES WHICH REPRESENT THE ALIGNMENT OF A MAGNET PLACED AT A POINT IN SPACE. • AN ARROW CAN BE DRAWN AT A POINT TO SHOW THE DIRECTION THAT THE “N” POLE POINTS • IF THERE ARE A GREATER NUMBER OF LINES IN AN AREA, THE FIELD IS STRONGER THERE. N S

  16. MAGNETIC FIELD • MAGNETIC FIELD LINES POINT TOWARDS THE “S” POLE. • MAGNETIC FIELD LINES POINT AWAY FROM “N” POLES N S

  17. EARTH’S MAGNETIC FIELD SINCE A NORTH SEEKING MAGNETIC POLE IS ATTRACTED TOWARDS THE EARTH’S MAGNETIC POLE LOCATED NEAR GREENLAND, THIS POLE MUST BE A MAGNETIC SOUTH POLE.

  18. EARTH’S MAGNETIC FIELD

  19. EARTH’S MAGNETIC FIELD NORTH POLE S N SOUTH POLE

  20. MAGNETIC FIELD NEAR A WIRE THE FIELD NEAR A WIRE FORMS CIRCLES AROUND THE WIRE. MAGNETIC FIELD ELECTRON FLOW

  21. CHARGES MOVING IN CLOSED PATHS CREATE DIPOLE MAGNETIC FIELDS

  22. FIELD DUE TO A COIL CURRENT IN A COIL OF WIRE PRODUCES AN ELECTROMAGNET N S ELECTRON FLOW

  23. ELECTROMAGNET A STRONG ELECTROMAGNET CAN BE PRODUCED BY USING A FERROMAGNETIC CORE.

  24. ELECTROMAGNETINDUCTION A VOLTAGE WILL BE INDUCED IN A COIL WHILE A MAGNETIC FIELD MOVES THROUGH THE COIL. V N S

  25. ACTIVITY • ELECTROMAGNETIC INDUCTION

  26. TRANSFORMER TWO COILS PLACED UPON A FERROMAGNETIC MATERIAL FORMS A TRANSFORMER. V

  27. ACTIVITY • TRANSFORMER

  28. TRANSFORMER • IF CURRENT IS PRODUCED IN ONE COIL, IT’S MAGNETIC FIELD WILL MAGNTIZE THE CORE. • THE MAGNETIC FIELD OF THE CORE WILL INDUCE A VOLTAGE IN THE SECOND COIL. (SECONDARY) • THIS ONLY OCCURS WHILE THE CURRENT IS CHANGING IN THE FIRST COIL. (PRIMARY)

  29. ACTIVITY • FORCE ON A CURRENT CARRYING WIRE • AMAZING MOTOR

  30. FORCE ON A WIRE IF THE ELECTRONS IN A WIRE CROSS MAGNETIC FIELD LINES, THE WIRE WILL EXPERIENCE A NET FORCE. ELECTRONS FIELD FORCE N S

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