Class3HO - Class 3 Coulombs Law Physics 106 Fall 2011 Press...

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Class 3 Coulomb’s Law Physics 106 Fall 2011 Press CTRL-L to view as a slide show.
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Learning Outcomes from Last Time You should be able to answer these questions: I What is science? What is physics? I What is meant by physical "law"? I How does physics make use of models? I What do equations tell us? What don’t they tell us? I What math will I need for this course? I What are the four fundamental interactions of nature? I What two kinds of models do we use to describe forces at a fundamental level? I What is meant by a "field"?
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Learning Outcomes Today we will discuss: I Charging by conduction and induction I Coulomb’s law - the force between point charges I Using Coulomb’s law
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Basic Electrostatics Concepts
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What Causes Forces?
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How Will We Treat Electric and Magnetic Forces?
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Field Lines I We’ll use electric and magnetic field lines. I From Michael Faraday, c. 1820s I Model based on experimental results. I Field lines don’t really exist, but reality behaves the way field lines would behave if they existed!
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The Foundations of Electric and Magnetic Theory
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First Observations -Greeks I Observed electric and magnetic phenomena as early as 700 BC I Found that amber, when rubbed, became electrified and attracted pieces of straw or feathers I Also discovered magnetic forces by observing magnetite attracting iron
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Benjamin Franklin I 1706 -1790 I Systematic work on electricity in the 1740s led to the "one fluid" model of electricity. I Positive charge was a surplus of fluid, negative charge a deficit.
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Properties of Electric Charges I Two types of charges: + and - I Likes repel and unlikes attract I Positive charges are protons I Protons are held firmly in the nucleus
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Properties of Charge I Negative charges are electrons I Object becomes charged by gaining or losing electrons I Electric charge is always conserved I Charge is usually exchanged rather than created I Positive and negative charges are always created and annihilated in pairs
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I Charge is quantized I Most charge is a multiple of a fundamental unit of charge, symbolized by e I Electrons have a charge of - e I Protons have a charge of + e I Quarks are believed to have charges of 1/3 or 2/3 e . I
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Class3HO - Class 3 Coulombs Law Physics 106 Fall 2011 Press...

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