Electric Charge and Electric Field_Week 4.1

Electric Charge and Electric Field_Week 4.1 - Electric...

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Electric Charge and Electric Field Week 4 Electric charge: - positive (+) / negative (-) - unlike charges attract, like charges repel Law of conservation of charge: The amount of electric charge produced by any process is zero. Insulators/Conductors : Three types: conductors, semiconductors, insulators Induced/Conduction Charge Charging by conduction (contact): -net charge on both rods has changed charged neutral nonconductor insulator conductor neutral Contact, both charged

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Charging by Induction (no contact): 1) -no change in net charge on the rods, charges seperated -move charged rod away, charges recombine and rod is neutral again 2) -repelled charge moves down the wire into ground What if we cut the wire? neutral Induced Charge neutral Induced Charge (ground)
Coulomb’s Law 1 2 2 QQ F k r = k = 8.988x10 9 Nm 2 /c 2 [Q] = coulomb Example: Elementary charge: e = 1.602x10 -19 c (charge of electron = -e) K = 0 1 4 πε Scalar version of Coulombs Law 1 2 2 0 1 4 QQ F r = Vector version of Coulombs Law 1 2 2 0 1 ˆ 4 QQ F r r = r

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This note was uploaded on 05/03/2010 for the course PHYSICS 1B 318007200 taught by Professor Malkan during the Spring '10 term at UCLA.

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Electric Charge and Electric Field_Week 4.1 - Electric...

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