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03_24_Capacatance

# 03_24_Capacatance - Today 3/24 o l l l Plates of charge...

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Today 3/24 o Plates of charge l Capacitance l Lab: DC Circuits (read lab) l HW: 3/24 “Plate Potential 2” Due Thursday 2/27

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B A What is the change in potential energy in going from A to B? F qE F Hq W AB = qED PE AB = qED PE AB = q V AB V AB = ED AB W AB = qED Only applies when the field is uniform over the distance. V AB ‘s sign depends on the direction of E. In this case it’s positive.
Two conducting plates connected by a battery. d=1cm V=1000V What is the charge density σ on each plate? 0 ε σ = E d V = N/C 10 1 01 . 0 1000 5 × = = E 0 σ= 5 12 10 1 ) 10 8 . 8 ( × × = - 2 7 C/m 10 9 - × =

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d=2cm What happens to σ when the plates are moved twice as far apart? 0 ε σ = E d V = N/C 10 5 02 . 0 1000 4 × = = E 0 σ= 4 12 10 5 ) 10 8 . 8 ( × × = - 2 7 C/m 10 5 . 4 - × = The E-field and σ would both be one half the size. V=1000V
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03_24_Capacatance - Today 3/24 o l l l Plates of charge...

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