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1 A magnet attracts certain materials … Iron Steel Cobalt Nickel 2 A bar magnet is strongest at each end Magnetic Poles 3 A suspended magnet points approximately North South Com p ass Northseeking pole Southseeking pole Magnetic poles exist in pairs … Equal strength 4 Like poles repel Unlike poles attract 5 Induced Magnetism 6 Iron and Steel Iron Magnetically soft Easy to magnetise Loses its magnetism easily Steel Magnetically hard More difficult to magnetise Better at keeping its magnetism 7 A region where there is a force on a moving charge. (A region where magnetic forces can be felt.) Direction … Plotting compass 8 A line that shows the direction of the force on a north pole Point north to south The tangent to the line shows the direction of the magnetic field 9 To Plot The Magnetic Field Due To A Bar Magnet Dots 10 To Plot The Magnetic Field Due To A Bar Magnet or Use iron filings 11 HorseShoe Magnet Earth’s Magnetic Field 12 Demo 1819 Han Christian Oersted Large current // Resistor 13 Battery 14 15 Poles ?? Magnetic Field Coil > Loop 16 Similar to … 17 Battery etc. … 18 Solenoid + soft iron core Current on … Current off … Uses Scrapyards Electric motors Electromagnetic relays 19 Ø “Bar magnet” Ø Electric currents … Ø Mag. Declination (Mag. Variation) Ø Angle of dip Ø Navigation 20 Earth’s Magnetic Field Magnetic Declination Magnetic Dip 21 22 23 24