lecture2

lecture2 - Physics 2102 Gabriela Gonzlez Charles-Augustin...

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Physics 2102 Gabriela González Charles-Augustin de Coulomb (1736-1806)
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negative electron cloud • nucleus of positive protons, uncharged neutrons • Z = atomic number = # of protons = # of electrons in a neutral atom • A = mass number = # of protons (Z) + # of neutrons (N) electron charge = e = ± 1.6 x 10 -19 Coulombs = - proton charge electron mass = 9.10938188 × 10 -31 kilograms proton mass = 1.67262158 × 10 -27 kilograms = neutron mass
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In a conductor , electrons move around freely, forming a “sea” of electrons. This is why metals conduct electricity. Charges can be “induced” (moved around) in conductors. Blue background = mobile electrons Red circles = static positive charge (nuclei) - - + +
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In an insulator , each electron cloud is tightly bound to the protons in a nucleus. Wood, glass, rubber . Note that the electrons are not free to move throughout the lattice, but the electron cloud can “distort” locally. + -
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An object can be given some “excess” charge: giving electrons to it (we give it negative charge) or taking electrons away (we “give” it positive
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This note was uploaded on 05/20/2011 for the course PHYS 2102 taught by Professor Gimmnaco during the Fall '08 term at LSU.

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lecture2 - Physics 2102 Gabriela Gonzlez Charles-Augustin...

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