Roldan_Chap21_PHY2049 - Introductory Physics for Scientists...

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Introductory Physics for Scientists and Engineers (II) PHY2049 Beatriz Roldán Cuenya Department of Physics, University of Central Florida http://physics.ucf.edu/~roldan Book: University Physics (Vol 2), Young and Freedman, 12 th ed.
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Chapter 21 – Electric Charge and Electric Field - Electric Charge - Conductors, Insulators and Induced Charges - Coulomb’s Law - Electric Field and Electric Forces - Electric Field Calculations - Electric Field Lines - Electric Dipoles
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1. Electric Charge Electrostatics: interaction between electric charges that are at rest. Two + charges and two – charges repel each other. + charge and – charge attract each other.
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Electric Charge and the Structure of Matter Structure of atoms: electron (-) proton (+) neutron (uncharged) Combinations of quarks ( ± 1/3 e, ±2/3 e b e = electron charge) = Nucleus -Electrons (-) held within atom by attractive forces from (+) nucleus. - Protons & neutrons held by an attractive interaction: strong nuclear force (short range) >> electric repulsion of protons. - Magnitude of charge of electron = magnitude of charge of proton.
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- Neutral atom: # of electrons = # of protons. - Atomic number: # of protons or electrons in a neutral atom. - Ion: atom that has lost (+) or gained (-) one or more electrons. - Ionization: process of gaining or loosing electrons.
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Conservation of charge: the sum of all electric charges in any closed system is constant. - The magnitude of charge of the electron / proton = unit of charge.
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Roldan_Chap21_PHY2049 - Introductory Physics for Scientists...

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