# lecture8 - Electric Potential(II Review Electric Potential...

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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? What is the electric potential at distance r from a point charge Q? +Q r r Q k E e ˆ 2 = 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  10 cm from an isolated point charge of   -100 nC ?

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Potential of Several Point Charges Potential of Several Point Charges
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lecture8 - Electric Potential(II Review Electric Potential...

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