Lecture+07+jan+26 - Lecture 7 Electric Potential and...

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Lecture 7 Electric Potential and Equipotential Surfaces Exam watch Feb 2
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U of point charge q 0 in any electric field (define the electric potential, V) - = - = - = - f ref f ref E E ref f l d E q l d F W U U 0 Volt Coulomb Joules l d r E q U U V V f ref ref f ref f - = - = - ) ( 0 recall how we defined E = F/q 0 , let’s define V(r)=U(r)/q 0 : ) ( ) ( 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
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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
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Summary: 2 methods to calculate V(r) 1. If you know along a path then (always ) ) ( r E - = - = - f i i f i f l d E q U U V V 0 2. If you know the charge distribution (and V can be 0 at
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Lecture+07+jan+26 - Lecture 7 Electric Potential and...

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