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Chapter 16 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Electric Charge fundamental property of matter basis of al electric and magnetic phenomena The Atom: Proton charge +1 Electron charge –1 Neutron charge 0 Net charge q net = q (+) + q (–) Neutral means q net = 0 Law of Conservation of Charge : Net charge of a closed system never changes. Polarization – neutral object has (+) separated from (–). Discuss conductors, insulators, semiconductors, superconductors Grounding – create a conducting path to the ground (common discharge method). Charging Macroscopic Objects : q net (+) lost electrons, q net (–) gained electrons 1) Rubbing – friction 2) Conduction – contact 3) Induction – polarize, then ground Coulomb’s Law unlikes attract, likes repel q 1 q 2 2 2 1 r q q k F E q 1 , q 2 must be measured in coulombs (C) r k = 8.99×10 9 N-m 2 /C 2 Elementary charge e = 1.602×10 –19 C = charge on proton/electron Electric Field invisible “signal” around every charge
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Unformatted text preview: represented as a vector at every point in space F E = q E “my field causes your force” and vice versa 2 r q k E magnitude of field at distance r from single point charge Chapter 16 Notes College Physics by Giambattista et al. John B. Ross, Ph.D. IUPUI Physics Dept. Accelerator Problems, Part 1 : a = F E / m = q E / m + constant acceleration toolkit: v f = v i + at d = v i t + ½ at 2 d = ½ ( v i + v f ) t v f 2 = v i 2 + 2 ad Kinetic energy K = ½ mv 2 Conductors in Electrostatic Equilibrium why should you stay inside your car during a thunderstorm? Suppose lightning deposits a net charge to your neutral car. What happens? 1) Excess charge stays on outer surface. 2) Excess charge accumulates along sharp points and edges. 3) No electric field penetrates to the interior. 4) Electric field sits perpendicularly to the outer surface....
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