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Unformatted text preview: Lecture 7 (January 26) Electric Potential and Equipotential Surfaces Exam watch A practice exam(s) will appear in ctools/resources today or tomorrow Exam locations are already posted Practice exam review planned for Tuesday 1/29 at 6:30 pm in 340 West Hall U of point charge q in any electric field (define the electric potential, V) ∫ ∫ ⋅ = ⋅ = f ref f ref E ref f l d E q l d F U U Volt Coulomb Joules l d r E q U U V V f ref ref f ref f ≡ ≡ ⋅ = = ∫ ) ( recall how we defined E = F/q , let’s define V(r)=U(r)/q : ) ( ) ( that note and r E r V = ∇ This scalar function is called the Potential and is a scalar property of the distribution that produces E(r) Review Calculating for charge distributions (use only if zero of V can be at ∞) ) ( r V r kq r V pt = ) ( ∫ = charge ) ( r kdq r V dist ∑ = i i i pts r kq r V ) ( or, you can integrate the E field along some path if E is known along the path Review Summary:...
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 Spring '08
 DaveWinn
 Electric Potential

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