# lecture8 - Electric Potential(II ntial of a point charge...

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Electric Potential (II) Potential of a point charge Potential of several point charges Potential energy of a collection of charges

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Review: Electric Potential Review: Electric Potential charge energy potential V dx dV E x - = dV = - • E ds Electric potential is not an absolute quantity. It is always relative to the potential V=0 for our choice of position. Most often we choose V=0 at the position of infinity.
What is the electric potential at distance r from a point charge Q? +Q r

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Solution
Eg: a) What shape are the equipotential surfaces near an isolated point charge? b) What is the potential 10 cm from an isolated point charge of 100 nC ? c) What is the potential -100 nC ?

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Potential of Several Point Charges Potential of Several Point Charges Potentials add (as scalars! ). r i are distances! 1 r 2 r A At A: 1 2 1 2 ( ) e q q V k r r = + In General: i e i i q V k r = Or… e dq V k r = (for a continuous charge distribution) (for a discrete
Quiz : +q a a a a O A single charge q produces a potential V 0 = 1000 V at point O.

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## This note was uploaded on 01/23/2011 for the course ENG 1D04 taught by Professor Done during the Spring '08 term at McMaster University.

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lecture8 - Electric Potential(II ntial of a point charge...

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