Lect08 - Physics 213! ! Sept. 19, 2006 Physics 213! ! Sept....

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today Electric charge, conductors and insulators Induced charges Electric force • Electric field Physics 213 Sept. 19, 2006 8.1 Conservation of electric charge— Electric charge is never created or destroyed, but only transferred. Matter: basic unit of charge = e Electron (e): q = -e Proton (p): q = +e Neutron (n): q = 0 Atoms (appear neutral): - electron charges “screen” proton charges Ions: - atoms with " 1 e’s missing (+ ion) or gained (- ion) Physics 213 Sept. 19, 2006 8.2 Electrical conductors : charge can move freely around. Examples: 1.metals 2.ionic liquids (both “+” and “-” charges) 3.plasmas semiconductors Electrical insulators : charges are stuck and can’t move around. Examples: molecular solids molecular liquids gases Physics 213 Sept. 19, 2006 8.3 Induced charge— Separation of “+” and “-” charges within object • conducting object: • insulating object: Physics 213 Sept. 19, 2006 8.4
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This note was uploaded on 05/25/2008 for the course PHYS 2213 taught by Professor Perelstein,m during the Spring '07 term at Cornell University (Engineering School).

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Lect08 - Physics 213! ! Sept. 19, 2006 Physics 213! ! Sept....

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