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MAGNETISM N S MAGNETISM IS PRODUCED BY MOVING CHARGES. MAGNETISM TOPICS S N Identifying magnetic materials Magnetic poles Magnetic materials Magnetic fields Electromagnets MAGNETIC POLES THE “N” POLE OF A MAGNET MEANS THAT THIS POLE SEEKS THE NORTH POLE OF S N THE EARTH, IF THE MAGNET IS FREE TO ALLIGN ITSELF WITH THE EARTH’S MAGNETIC FIELD. LAWS OF ATTRACTION LIKE POLES REPEL N S N S N S UNLIKE POLES ATTRACT N S N S MAGNETIC POLES • A MAGNET IS A DIPOLE (TWO POLE). • THERE IS NO MONOPOLE (SINGLE POLE). S N • CUT A MAGNET IN HALF AND YOU GET TWO DIPOLES. N N SN S MAGNETIC MATERIALS • MOST MATERIALS ARE NOT MAGNETIC • NATURALLY OCURRING MAGNETIC MATERIALS ARE CALLED FERROMAGNETIC (IRON-LIKE) S N • FERROMAGNETIC MATERIALS ARE – IRON – COBALT – NICKLE FERROMAGNETIC MATERIALS The common metals, iron, nickel and cobalt are ferromagnetic. ThereS are two N rare earth elements, gadolinium and dysprosium which also possess this property. Lodestone N • 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 S word lodestone Asia Minor. The 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". FERROMAGNETISM • ELECTRONS HAVE MAGNETIC FIELDS DUE TO THEIR SPIN AND ORBITAL MOTION. • ATOMS OFNFERROMAGNETIC S MATERIALS POSSESS ELECTRONS WHICH HAVE MAGNETICS FIELDS THAT DO NOT CANCEL OUT INSIDE THE ATOM. MAGNETIC DOMAINS N S THESE ARE SMALL REGIONS IN A FERROMAGNETIC MATERIAL WHERE ALL THE MAGNETIC FIELDS OF THE ATOMS ARE ALIGNED. MAGNETIZATION N S N S IF THE DOMAINS ARE ALIGNED, THE MATERIAL IS POLARIZED AND BECOMES MAGNETIZED MAKING A MAGNET A PIECE OF SOFT IRON CAN BE MAGNETIZED BY N RUBBING ONE ENDS WITH ONE POLE OF A STRONG MAGNET. 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 S N THE “N” POLE POINTS • IF THERE ARE A GREATER NUMBER OF LINES IN AN AREA, THE FIELD IS STRONGER THERE. N S MAGNETIC FIELD • MAGNETIC FIELD LINES POINT TOWARDS THE “S” POLE. • MAGNETIC FIELD LINES POINT AWAY FROM “N” POLES S N N S EARTH’S MAGNETIC FIELD SINCE A NORTH SEEKING MAGNETIC POLE IS ATTRACTED TOWARDS THE S N EARTH’S MAGNETIC POLE LOCATED NEAR GREENLAND, THIS POLE MUST BE A MAGNETIC SOUTH POLE. EARTH’S MAGNETIC FIELD NORTH POLE S S N N SOUTH POLE EARTH’S MAGNETIC FIELD NORTH POLE S S N N SOUTH POLE MAGNETIC FIELD NEAR A WIRE THE FIELD NEAR A WIRE FORMS CIRCLES AROUND THE WIRE. N S MAGNETIC FIELD ELECTRON FLOW CHARGES MOVING IN CLOSED PATHS CREATE DIPOLE MAGNETIC FIELDS N S FIELD DUE TO A COIL CURRENT IN A COIL OF WIRE PRODUCES AN ELECTROMAGNET N N S ELECTRON FLOW S ELECTROMAGNET A STRONG ELECTROMAGNET CAN BE PRODUCED BY USING A FERROMAGNETIC CORE. N S