Charged electrons orbit r10 10 m january 22 2014

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Unformatted text preview: 4 9 Concept of Charge •  Charge is an intrinsic property of matter •  Two types: Positive Charge Negative Charge Opposites Attract + Likes Repel January 22, 2014 + - Physics 104, Spring 2014 + 10 Atomic Theory •  All things are made out of atoms •  Basic constituents of an atom: –  Protons: 1 unit of Positive Charge –  Electrons: 1 unit of Negative Charge –  Neutrons: Neutral •  Atoms are usually neutral –  Positively charged central nucleus r~10-15 m –  Negatively charged electrons orbit r~10-10 m January 22, 2014 Physics 104, Spring 2014 11 Charges are…. Unit of electric charge is a Coulomb •  Quantized: In suitable units, charges can only take on integer values: 1, 2, 3. –  Not fractional values, like 1.2, 4.25, … •  Conserved: You can’t create or destroy net electric charge •  An electron has one unit of charge = 1 e- e− = −1.6 × 10−19 C January 22, 2014 Physics 104, Spring 2014 12 Conductors and Insulators Electrons are free to move in a conductor Electrons stay with their atom in an insulator Most things are in between perfect conductor/insulator January 22, 2014 Physics 104, Spring 2014 13 Charging by Induction •  Bring a charged rod near •  Polarizes conductors in its proximity Positive charged rod results in positive leaves. January 22, 2014 Physics 104, Spring 2014 14 Charging a Metal Object Neutral s...
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This note was uploaded on 02/14/2014 for the course PHYSICS 103 taught by Professor Citrinini during the Spring '09 term at University of Wisconsin.

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