02-Induction and Coulomb

02-Induction and Coulomb - Phys 212 - Fall 2009 8/24/2009...

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Phys 212 - Fall 2009 8/24/2009 Induction Coulomb’s Law
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Recap - Properties of Charge Many charges in an object - Avagadro’s # Charge is positive or negative Most objects are charge neutral : N + =N - Opposite charges attract, like charges repel Charge is quantized : Q=Nq e Charge is conserved - net charge of an isolated system remains constant A charged object has an imbalance of Q + or Q - Imbalance can be induced or transferred
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Induction Electrophorus 1) rub Tefon plate with wool/Fur - leave - charge 2) touch electrode to tefon 3) ground electrode (touch) Note: charge does not fow between objects when they touch since tefon is not a conductor 1) 3) 2) e -
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Electroscope Charge the electroscope by induction . electroscope ------ 1) electroscope initially charge neutral 2) bring charged plate near electroscope 3) negative charge in electroscope is attracted to positive plate 4) resulting positively charged defection arm moves 5) remove charged plate and negative charges redistribute 6) charge neutral arm shows no defection defection is temporary
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02-Induction and Coulomb - Phys 212 - Fall 2009 8/24/2009...

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