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Transcript
Week 5: Magnetism October 16th, 2015 Katie Hellier IRIS Science Academy Last Week • Electric Fields • Where do they come from? • How do they work? • What effects do they have on us? Magnetism • Moving charges interacting with moving charges • Ex: two wires • Electro-magnetic interactions are linked • Magnetic forces are electrical forces in a different frame of reference (relativity) • Comes from what the material is made of (atoms, structure) How does it work? Think about electricity – attraction vs repulsion Video • Bill Nye the Science Guy Magnetic Fields B~I Units: T (Tesla) • Create the force exerted on a charge due to magnetism • Field lines move from North to South • Objects align along field (ie compass) • Magnetic poles are where field lines start and end • Direction – Force is perpendicular to both the magnetic field and direction of motion Earth’s Field • Molten Iron core • Field keeps radiation and solar winds out • Creates Aurora Borealis • Like to bar magnet • Why is North actually South? Video • The Science Behind Magnets Different Types of Magnets • Ferromagnetic: • Permanent magnet – creates own field, is attracted to other magnets • Paramagnetic: • Temporary magnet – attracted by an external field, goes away • Electromagnets: • Adjustable magnets created by running current through a coil of wire Phets • Magnet and Compass • Magents and Electromagnets Magnetism Lab • Mapping the magnetic field • Pick a partner • Select a magnet • Work with the table to graph the magnetic field
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