Coulomb's Law

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Coulomb's Law

Today we went over Conductors, Insulators, and Coulomb's Law. Cutnell 18.4-18.5

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The University of Vermont
Phys 012 - Elementary Physics
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Lecture 2 Outline of Last Lecture I. Fundamental Charge (e) a. e = 1.6 x 10^-19 C b. electron charge = -e c. proton charge = +e II. Total Charge (q) a. q = Ne i. N = number of particles (integer) III. Charge Transfer: 3 types a. By friction b. By conduction (contact = direct flow of electrons) - uncharged object ends up with same charge as charged object c. By inductions (no contact, just polarization) - uncharged object ends up with opposite charge of charged object Outline of Current Lecture II. Insulators: contain no free electrons that can move around easily a. Conduct electric charge poorly III. Coulomb’s Law: the magnitude F of te electrostatic force exerted by one point charge q1 on another point charge q2 is directly proportional to the magnitudes |q1| and |q2| of the charges and inversely proportional to the square of the distance r between them (Cutnell 535) a. F = (k |q1||q2|)/r2 b. k = proportionality constant = 8.99 x 109 (N*m2)/C2 F12 = - F21 (Newton’s 3rd Law) Physics 012 1st Edition

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