CHAPTER 5 PHYSICS FOR JUNIOR HIGH SCHOOL IX
INDICATION OF MAGNETIC Magnet can pull certain things
PHYSICS FOR JUNIOR HIGH SCHOOL IX MAGNETIC INDICATION ORIGIN OF MAGNET magnesia, Word “magnet” comes from magnesia, that is a name of an area at small Asia, where was founded iron stone more than 2000 years ago. Chinese nation have used magnetic compas as direction in sailing since 1200.
PHYSICS FOR JUNIOR HIGH SCHOOL IX INDICATION OF MAGNETIC COMPOSITION OF MAGNETIC AND NON MAGNETIC Composition of magnetic: composition that can be strongly pulled by magnet can be magneted. E.g.: iron, steel, nickel, cobalt Composition of Non-magnetic, : Composition of paramagnetic, composition that can be weakly pulled by magnet and cannot be magneted. E.g.: aluminum, platinum Composition of diamagnetic, Composition that can be weakly pushed by magnet and cannot be magneted. E.g.: zinc, bismuth
PHYSICS FOR JUNIOR HIGH SCHOOL IX MAGNETIC EFFECT Magnet pole is tips of magnet that have big trade offs force and repellence. Each magnet has two pole, north pole ( N ) and south pole (S). Magnet has Two Pole
PHYSICS FOR JUNIOR HIGH SCHOOL IX MAGNETIC EFFECT CHARACTERISTICS OF MAGNET POLE Different pole will trade-offsSame pole will repellence
PHYSICS FOR JUNIOR HIGH SCHOOL IX HOW TO MAKE MAGNET 1. Rubbing Rubbing magnet regularly at iron and armor, hence iron and armor will have magnetic characteristic. Magnet pole is different with pole of synthetic magnet.
PHYSICS FOR JUNIOR HIGH SCHOOL IX HOW TO MAKE MAGNET Using Electromagnetic Magnet pole can be determined by right hand method: four hand = electromagnetic direction ( I ) thumb = north pole direction ( N )
PHYSICS FOR JUNIOR HIGH SCHOOL IX HOW TO MAKE MAGNET 3. INDUCTION If an iron or armor are brought nearer (don’t touch) to strong magnetic object, so the iron or armor will be magnet. The process is called induction. If the iron is separated from the object, magnetic of iron will loss its characteristic, but armor will held it.
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