Lecture9_Fall2008 - Lecture9:ElectricityI Chapter11 Plan 1....

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1 Lecture 9: Electricity –I Chapter 11 Plan 1. Electric Charge 2. Coulomb’s Law 3. Electric Field and Electric Potential 4. Electric Current Chapter 11: Homework Review Questions: 1, 2, 4, 5, 6 Exercises: 4, 6 Problems: 1, 3, 4 Electric Charge Electric charge is one of the basic characteristics of matter. There are positive and negative charges! ¾ Rule 1: Like charges repel each other ¾ Rule 2: Unlike charges attract each other Elementary Charge Important facts about the charge. I. All charges are multiple of an elementary charge which can be positive or negative. II. In nature, there is a number of elementary particles that carry an elementary charge. Among these, the most important are an electron that carries negative electrical elementary charge and a proton that carries equal but positive electric elementary charge .
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2 Discovery of Electron 1897 Experiments by Joseph John (J.J.) Thomson in 1897 led to the discovery of a fundamental building block of matter – an electron. J. J. Thomson was experimenting with currents of electricity inside empty glass tubes. He was investigating a long-standing puzzle known as "cathode rays." His experiments prompted him to make a bold proposal: these mysterious rays are streams of particles much smaller than atoms which are known
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Lecture9_Fall2008 - Lecture9:ElectricityI Chapter11 Plan 1....

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