Mar 4 2005 web.mit.edu/8.02x/wwwEF ExperimentAluminum FoilSmall V - Foil lies on lower plateBigger V - Foil jumps up and connects washersMar 4 2005 web.mit.edu/8.02x/wwwEF ExperimentBigger V - Foil jumps up and connects washers• Make sure that foil is clean,flat and not too smooth• Start with foil flat on lowerwasher and min HVPS voltage• Slowly turn up HVPS until foiljumps• Foil jumps when V = Vjumpsuch that electrostatic forcebalances weight of foil• Repeat experiment severaltimes for each foil to getconsistent Vjump• Repeat with foils folded tohave 1, 2, 3 layersMar 4 2005 web.mit.edu/8.02x/wwwDemo I+++++++++++++ElectroscopeCharged IonsMar 4 2005 web.mit.edu/8.02x/wwwDemo I++++++++ElectroscopeCharged IonsIons discharge ElectroscopeMar 4 2005 web.mit.edu/8.02x/wwwDemo INeutral molecules:Pos. and neg. charges move together -> No current!Ions:Pos. and neg. charges move separately -> Current |I| > 0 !Mar 4 2005 web.mit.edu/8.02x/wwwDemo IIVoltage sourceGlassLight BulbMar 4 2005 web.mit.edu/8.02x/wwwDemo IIVoltage sourceGlassLight BulbLead IonsMar 4 2005 web.mit.edu/8.02x/wwwDemo IIVoltage sourceGlassLight BulbLead IonsSolid glass: Potential charge carriers are stuck!Mar 4 2005 web.mit.edu/8.02x/wwwDemo IIVoltage sourceGlassLight BulbMolten glass: Charge carriers become mobile ->Current flows -> Bulb lights
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