Lecture 18

# Lecture 18 - Chap. 21 Electric Charge, Coulomb's Law and...

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June 5, 2008 Physics 40B Lecture 18 1 Chap. 21 Electric Charge, Coulomb’s Law and Electric Field Review Announcements Course ieval available this week Formula sheet and Final Exam Information now on ilearn Sample Final Exam Problems now available on ilearn Homework Assignment #10 now due next Monday (5/9/08) at Midnight Final exam next Friday at 8:00 AM-Bring SCANTRON E ntropy Change dS = dQ T " S = S f # S i = dS = i f \$ dQ T i f \$ with units J/K %" S = 0 for reversible Carnot cycle Entropy Statement of Second Law of Thermodynamics: Universe = System + Surroundings Δ S univ = S syst + S sur For any process S univ 0 (= 0 for reversible, > 0 for irreversible) Entropy Change for Ideal Gas: " S gas = nC V ln T f T i # \$ % & ( + nR ln V f V i # \$ % & (

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June 5, 2008 Physics 40B Lecture 18 2 Charge: Positive & Negative Two kinds of charge Positive: + (glass) & - (silk) Negative: - (plastic/rubber) & + (fur) Like Charges Repel Opposite Charges Attract Conservation of Charge: total charge is constant, it can’t be destroyed but it can be transferred. Electrons as negative charge (can move around) Protons and ions as positive charge (stationary) Discrete charges (quantized): e = - 1.60 x 10 -19 Coulombs (C) Ben Franklin 1747
June 5, 2008 Physics 40B Lecture 18 3 Demonstrations with Charges Charging by Induction Measure charge with Electroscope Gold leaves: separate when charged

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June 5, 2008 Physics 40B Lecture 18 4 Early Demonstrations of Charge
June 5, 2008 Physics 40B Lecture 18

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## This note was uploaded on 06/18/2008 for the course PHYS 40c taught by Professor Allenzych during the Spring '08 term at UC Riverside.

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Lecture 18 - Chap. 21 Electric Charge, Coulomb's Law and...

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