chapter15-1r

# chapter15-1r - Chapter 15 Electric Forces and Electric...

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Unformatted text preview: Chapter 15 Electric Forces and Electric Fields Problem I Thunder follows the flash of lightening about 5 seconds for each mile away. What is the speed of sound? 1. 1000 ft/s 2. 100 ft/s 3. 10 ft/s 4. 1 mile/s 5. 2 mile/s First Observations – Greeks Observed electric and magnetic phenomena as early as 700 BC Found that amber, when rubbed, became electrified and attracted pieces of straw or feathers Also discovered magnetic forces by observing magnetite attracting iron Benjamin Franklin 1706 – 1790 Printer, author, founding father, inventor, diplomat Physical Scientist 1740’s work on electricity changed unrelated observations into coherent science Properties of Electric Charges Two types of charges exist They are called positive and negative Named by Benjamin Franklin Like charges repel and unlike charges attract one another Nature’s basic carrier of positive charge is the proton Protons do not move from one material to another because they are held firmly in the nucleus More Properties of Charge Nature’s basic carrier of negative charge is the electron Gaining or losing electrons is how an object becomes charged Electric charge is always conserved Charge is not created, only exchanged Objects become charged because negative charge is transferred from one object to another Properties of Charge, final Charge is quantized All charge is a multiple of a fundamental unit of charge, symbolized by e Quarks are the exception Electrons have a charge of – e Protons have a charge of +e The SI unit of charge is the Coulomb (C) e = 1.6 x 10-19 C Prob. 2 There are two pairs of heavily charged plastic cubes. Cubes 1 and 2 attract each other and cubes 1 and 3 repel each other. Which of the following illustrates the forces of cube 2 on cube 3 and cube 3 on cube 2?...
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## This note was uploaded on 12/15/2011 for the course PHY 2054 taught by Professor Avery during the Spring '08 term at University of Florida.

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chapter15-1r - Chapter 15 Electric Forces and Electric...

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