chapter24

# chapter24 - .A aera gnivah dna)etinifni sa setalp gnitaert...

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Capacitor Any two pieces of metal (conductor) brought near each other. Parallel plate capacitor L W Area A = L x W Charged capacitor “Charged Capacitor” has no net charge. +++++++++++++++++++++++ ----------------------------------------- +Q -Q E=0 E=0 E Electric Field (treating plates as infinite) and having area A. = = = A Q E E 0 0 1 | | ε σ v d

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Capacitance +++++++++++++++++++++++++++ ---------------------------------------------- +Q -Q = = A Q E 0 0 1 ε σ Ed r d E V V = = = v v ) ( 0 d A Q V = We define “capacitance” V Q C For parallel plate capacitor d A C 0 d Capacitance V Q C Can think of capacitor as a device for storing charge (and also energy). Units [Capacitance] = [Coulomb/Volt] = [Farad]
L L d A parallel-plate capacitor has square plates of edge length L, separated by a distance d. If we doubled the dimension L and halve the dimension d, by what factor have we changed the capacitance? A) 1.0 B) 2.0 C) 4.0 D) 8.0 E) 16.0 () 2 22 o oo o 2L AL L C8 dd d / 2 d ε εε ε == = CPS Question How big is a one Farad Capacitor? CPS question Assume you have two parallel plates that are separated by 1 mm. If you estimate ε 0 ~ 10 -11 , what is the area of the plates to have a 1.0 Farad capacitance?

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• Fall '10
• Feiguin

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