POWER OF ATTRACTION

 IN OUR EARTH THERE ARE MANY MYSTERY HAVE BEEN ALIVE TODAY. THERE ARE MORE AMAZING AND UNBELIEVABLE HAPPEN IN PAST.TODAY, WE USE A THING THAT HELP US TO ATTRACT METALS,LIKE SPITTING THE METALS FROM GARBAGE AND LIFT A HEAVY METALED OBJECT ETC......

MAGNES

MAGNES IS A GREEK SHEPHERD BEFORE 4000 YEARS AGO.HE WAS THE FOUNDED OF MAGNETS IN THE YEAR 6TH CENTURY BC. HE WAS GOING WITH A METAL STICK WITH HIS FLOCKS[GROUP OF SHEEP] SUDDENLY HIS SHOE STUCK ON THE WHICH WAS MADE BY METAL.WERE HE WAS CONFUSED THAT HOW THE SHOE CAN STUCK ON GROUND.AND HE TRY BY HIS STICK WERE THE TRIP HAVE A NAIL AND SICKED IN THE GROUND.HE DIG THE GROUND AND HE GOT A STONE THAT WAS LODESTONE,WHICH CONTAIN MAGNETIC POWER.

                                         ACTUALLY , HE DID NOT FOUND THE MAGNET . HE FOUND ONLY LODESTONE. THE FATHER OR DISCOVERY OF WAS WILLIAM GILBERT.HE FOUND THE MAGNET IN THE YEAR OF 1600.HE WAS A PHYSICIAN AND GREAT NATURAL PHILOSOPHER.HE PASSIONATELY REJECTED BOTH THE PREVAILING ARISTOTELIAN PHILOSOPHY AND THE SCHOLASTIC METHOD OF UNIVERSITY TEACHING. HE IS REMEMBERED BY HIS BOOK DE MAGNETE[1600]. HE WAS THE ORIGIN OF DISCOVERY OF ELECTRICITY. ALSO HE IS KNOWN FATHER OF ELECTRICITY. 

A MAGNETS IS A OBJECT THAT PRODUCES A MAGNETIC FIELD. THE FIELD IS INVISIBLE BUT IS RESPONSIBLY FOR MOST OF THE MAGNETIC PROPERTIES.A FORCE THAT PULLS ON OTHER FERROMAGNETIC MATERIALS SUCH AS IRON,AND ATTRACTS OR REPELS OTHER MAGNETS.

PERMANENT MAGNETS

IT IS A OBJECT MADE FROM A MATERIEL THAT IS MAGNETIZED AND CREATES IT OWN PERSISTENT MAGNETIC FIELD. AN EVERYDAY EXAMPLE IS A REFRIGERATOR MAGNET USED TO HOLD THE DOOR OF THE REFRIGERATOR .THE MATERIAL THAT CAN BE MAGNETIZED,WHICH ARE ALSO THE ONES STRONGLY  ATTRACTED TO A MAGNET, ARE CALLED FERROMAGNETIC OR FERRIMAGNETIC .THE METALS ARE IRON,NICKEL AND COBALT AND THEIR ALLOYS, SOME ALLOYS OF RARE-EARTH METALS, AND SOME NATURALLY OCCURRING MINERALS  SUCH AS LODE STONE .ALTHOUGH FERROMAGNETIC MATERIALS ARE ONLY ONES ATTRACTED TO A MAGNET STRONGLY ENOUGH TO BE COMMONLY CONSIDERED MAGNETIC, ALL OTHER SUBSTANCES RESPOND WEAKLY TO A MAGNETIC FIELD,K BY ONE SEVERAL OTHER TYPES OF MAGNETISM. 

FERROMAGNETIC MATERIALS CAN BE DIVIDED INTO MAGNETICALLY"SOFT" MATERIALS LIKE ANNEALED IRON,WHICH CAN BE MAGNETIZED BUT DO NOT TEND TO SAY MAGNETIZED, AND MAGNETICALLY"HARD" MATERIAL,WHICH DO A LONG TIME. PERMANENT MAGNET ARE MADE FROM "HARD" FERROMAGNETIC MATERIALS SUCH AS ALNICO AND FERRTE THAT ARE SUBJECTED TO SPECIAL PROCESSING IN A STRONG MAGNETIC FIELD DURING MANUFACTURE TO ALIGN THEIR 

INTERNAL MICROCRYSTALLINE STRUCTURE,MAKING THEM VERY HARD TO DEMAGNETIZE.TO DEMAGNETIZE A SATURATED MAGNET A CERTAIN MAGNETIC FIELD MUST BE APPLIED,AND THIS THRESHOLD DEPENDS ON CORECIVITY OF THE RESPECTIVE MATERIAL."HARD" MATERIALS HAVE HIGH COERCIVITY, WHEREAS "SOFT" MATERIALS HAVE LOW CORECIVITY. THE OVERALL STRENGTH OF A MAGNET IS MEASURED BY ITS MAGNETIC MOMENT OR, ALTERNATIVELY,THE TOTAL MAGNETIC FLUX IT PRODUCE.THE STRENGTH OF THE MAGNETISM IN A MATERIAL IS MEASURED BY ITS MAGNETIZATION. THERE IS A OTHER MAGNET CALLED ELECTROMAGNET. IT IS MADE BY A COIL OF WIRE THAT ACTS AS A MAGNET WHEN THE CURRENT TRAVEL IN THE COIL.WHEN THE CURRENT STOP IT GET DEMAGNETIZE.WHEN A SOFT OR FERROMAGNETIC MATERIAL SUCH AS MILD STEEL, WHICH PRODUCE MORE MAGNETIC FIELD PRODUCED BY THE COIL.THE POWER OF ATTRACTION IS MORE..........

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