lecture 11 100930 - Forces and Fields Electric and Magnetic...

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Forces and Fields Electric and Magnetic Forces Greeks recorded observations of electric and magnetic phenomena-- 700 BC s Thales 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 s 1706 – 1790 s Printer, author, founding father, inventor, diplomat s Physical Scientist s 1740’s work on electricity changed unrelated observations into coherent science Like people there are 2 kinds of Electric Charge Named by Ben- Plus and Minus + and - s Like charges repel s 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 of atoms s Nature’s basic carrier of negative charge is the electron s Gaining or losing electrons is how an object becomes charged s Electric charge is always conserved s Charge is not created, only exchanged s Objects become charged because
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lecture 11 100930 - Forces and Fields Electric and Magnetic...

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