lecture 15-1-1 - Chapter 15 Electric Forces and Electric...

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    Chapter 15 Electric Forces and Electric Fields
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    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
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    Benjamin Franklin 1706 – 1790 Printer, author,  founding father,  inventor, diplomat Physical Scientist 1740’s work on  electricity changed  unrelated  observations into  coherent science
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    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
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