Lecture 14

Lecture 14 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya...

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PEP112 – Spring 2008 Prof. Svetlana Malinovskaya 2 March 2008 Potential and Field
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Introduction • Large issue to address is the connection between the electric potential and electric field. • The potential and the filed are not two independent ideas, merely two different perspectives how the source charges alter the space around them.
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Finding the Potential from the Electric Field • First, the potential energy of the probe charge q and the source charges, divided by q, gives the electric potential • Second, the change in the potential energy is equal to the work done by the electric force • Third, the electric force is linearly proportional to the field. • Then the potential difference between two points in space is () ( ) f i f i s s s ss s fi s s s U VU V q q UW if F d s Fq E VV s V s VE s f o r t h e uniform electric field E ds ≡= Δ= = = = Δ
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How to find the potential difference between two points • Draw a picture and identify two points between which you wish to find the potential. Call them positions i and f.
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Lecture 14 - PEP112 Spring 2008 Prof. Svetlana Malinovskaya...

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