Review15

# Review15 - Modified from College Physics 8th Ed Serway and...

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Modified from College Physics , 8 th Ed., Serway and Vuille. For the quizzes and tests, you should know all the concepts and equations in this summary. Backround Material Force at a distance is explained by one of two types of models, Virtual Particle Models , and Geometric Models . Our best understanding of electromagnetic forces uses a virtual particle model called QED . Our best understanding of gravitational forces uses a geometrical model called General Relativity . Section 15.1: Properties of Electric Charges Electric charges have the following properties: 1. Unlike charges attract one another and like charges repel one another. 2. Electric charge is always conserved. 3. Charge comes in discrete packets that are integral multiples of the basic electric charge e . 4. The force between two charged particles is stronger when the charges are closer. When a charge is brought near an insulator, it can cause the charge to be polarized . Neutral objects can experience electrostatic force when charges are polarized. (This is why balloons stick

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## This document was uploaded on 12/15/2011.

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Review15 - Modified from College Physics 8th Ed Serway and...

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