week-10-1

week-10-1 - What does lightning have in common with hair on...

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What does lightning have in common. .. ... with hair on a dry winter day?
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Structure of matter in the Universe scale ~ 10 -15 m scale ~ 10 -10 m Huge scale Iron Wood Universe Gravitational Electromagnetic Strong Leptons: electron, muon, etc Current building block
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Quantization of Charge Fundamental unit: elementary charge e , 3 , 2 , 1 , n ne q • An electron carries a charge of –e ; a proton carries a charge of +e It is typically the electrons that move between objects. 19 19 1.602177 10 1.60 10 e C C Coulomb ( C ):
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Conservation of Charge The net electric charge is conserved in any physical process. But … • Charge can be transferred from one object to another. • Individual charges can also, in fact, be “destroyed” or “created”, but not net charges e e ( annihilation) ( pair production) 2 4 2 2 4 2 ( ) 2 ( ) ( ) ( ) ( ) Zn s H aq SO aq Zn SO aq H g
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Coulomb’s Law Charges with the same sign repel each other, and charges with opposite signs attract each other. The electrostatic force between two particles is proportional to the amount of electric charge that each possesses and is inversely proportional to the distance between the two squared. 1 2
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week-10-1 - What does lightning have in common with hair on...

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