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Refer sites:

http://www.physicsclassroom.com/class/estatics/Lesson-1/The-Structure-of...
https://www.nde-ed.org/EducationResources/HighSchool/Electricity/basicst...
http://www.ehs.utoronto.ca/services/radiation/radtraining/module1.htm
http://www.nobelprize.org/educational/physics/matter/1.html
http://en.wikipedia.org/wiki/Matter

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