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Class notes physics 1155 (PHYS1155)

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Electric potential notes

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  • September 8, 2024
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  • 2024/2025
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katewatchma
po.EE Energy

asthe downward
m oves
c harge from pointatopointbthe by
done
work theelectricfieldisindependentofthe theparticle
path takes
thusthe forceisconservative
electric


have
forces
conservative
anassociatedpotential fuction
energy

wifiEdi so f Vi
wherewe EaristheworkdonebytheconservativeforceF

haveeE
oncewe wecanuseconservationofenergyas
KinitiaVinitionKrinait
Urinal

where k Emr
unit end
Forauniformelectricfieldforexampletheelectricfieldproducedbytwoparallelplates wehave

WifediFsagesas whereas
sesiandEsisthecomponentoftheelectricfieldinthe s direction
noticetheelectricfield Es isnegativeTherefore suaesss.usvi laEsse aEssi
Verec
aess v

In at ecanbeposorneg




KEYRelationships




Example 1




em
mechanical
energy
Emg


iii tome
Es Ea we
2.82105
FINISH

, two
point wemustcalculate
charges

w f For f.fi or
Weobtainthepotentialenergyofasystemoftwopointcharges
U 4H

The
electric energyasystemofseveralpoint
chargesis
potential given by
U 4k 9
He air



ElectricPotential

inthesamewayasystemofcharges sources produce

if thechargesalsoproducea


die19h9mic there'sanelectricpotentialv theelectricpotential
Injury
edw.int


U qV




Theunitsofelectricpotential are C Voltv
Theelectricpotentialdifferencebetweentwopoints aandb is called voltage
VanAVVaVa


Ifc fetedicsEE.at
melting energy
tm s
Usource
sources




Theelectricpotentialof apointchargeisgivenby
V K9 e

For a collection ofchargeswehave

V 4T

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