ch21 - Chapter 21 1 Hydrodynamics and Electromagnetism Much...

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1 Chapter 21
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2 Hydrodynamics and Electromagnetism Much of the terminology is the same Some concepts can be applied between the two fields
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3 Amber
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4 Charging By Induction
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5 Two Things You Already Knew 1. Opposite charges attract 2. “Like” charges repel
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6 Remembering Gravitation Newton’s Law of Gravitation r r m Gm F ˆ 2 2 1 - =
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7 What is Mass? “resistance to acceleration” More fundamentally, a physical property of matter In large quantity, groups of matter seem to be always attracted to one another Personally, I’d say “mass” is a lot weirder than “charge”
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8 What is charge? Physical property of matter Two flavors: “plus” and “minus”
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9 What is the smallest charge possible? Millikan Oil Drop Experiment In 1910, Millikan was able to measure the charge of the electron Recall: Atom made up of nucleus and clouds of electrons outside nucleus Recall: nucleus: made up of protons and neutrons. Protons have charge equivalent to electrons. Neutrons are neutral Smallest charge possible is 1.602 x 10 -19 Coulombs (C) aka e
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10 Definition of Coulomb Abbreviation: C Amount of charge through a cross- section of wire in 1 second when there is 1 Ampere (A) of current. (We’ll cover the amp later)
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11 Okay, Mr. Smartguy, what about these quark-things? Quarks– particles which make up the proton and neutron The “up” quark has charge of +2/3 e The “down” quark has charge of -1/3 e They don’t count because there are no “free” quarks. They always are confined in a particle Proton- uud Neutron-udd
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Fundamental Particles Particle Symbol Charge in units of e Electron e, e - , β - -1 Proton p +1 Neutron n 0 Anti-electron (positron) β - +1 Anti-proton -1 Anti-neutron
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ch21 - Chapter 21 1 Hydrodynamics and Electromagnetism Much...

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