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Electrostatics Ch. 20
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Electrical Charge Positive – protons Negative – electrons
Only electrons jump from one object to another. Positive Charge – loss of electrons Negative Charge – gain of electrons Like charges repel Opposite charges attract
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Polarization Separation of Charges
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Charging By Conduction
Charging a neutral body by touching it with a charged body
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Charging By Induction Charging of an object without touching it
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Insulators – materials through which charges will not easily move
Conductors – materials through which charges will easily move
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Coulomb’s Law The force between 2 charges is proportional to the size of the charges and inversely proportional to the square of the distances. F= k(qAqB/d2) k = constant = 9.0 x 109 N.m2/c2
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SI unit of charge is the Coulomb (c)
1 coulomb is the charge of 6.25 x 1018 electrons or protons 1 electron = -1.6 x C A lightning bolt is about 10 coulombs
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