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Lect_1_note - Physics-013 Introductory Electromagnetism and...

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Introductory Electromagnetism and Modern Physics http://teaching.phys.ust.hk/phys013/
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Chapter 23 -1 Electric Fields
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Conclusions ± Rubbing gives new properties to these materials – Define as electric charges ± In 1600 the English scientist William Gilbert coined the New Latin word electricusfrom ηλεκτρον (elektron), the Greek word for "amber", which soon gave rise to the English words "electric" and "electricity”.
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Conclusions ± There are two kinds of electric charges ± Charges of the same type repel one another and charges with different types attract one another – positive and negative charge by definition ± Animation: understand electric charge
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Insulators ± Electrical insulators are materials in which all of the electrons are bound to atoms ± For example, glass, rubber and wood ± Animation ± Movie_Insulator
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Conductors ± Electrical conductors are materials in which some of the electrons are free electrons ± For example, copper, aluminum and silver ± Movie_Conductor
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Quantitative description of electric forces ± Magnitude ± Direction ± Sum rule
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Charles Coulomb ± Major contributions were in areas of electrostatics and magnetism ± Also investigated in areas of ± Strengths of materials ± Structural mechanics ± Ergonomics 1736 – 1806 French physicist
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Coulomb’s experiment
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Coulomb’s experiment θ d α
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_1_note - Physics-013 Introductory Electromagnetism and...

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