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241-23_Lec-7

# 241-23_Lec-7 - Physics 241 Lecture 7 Y E Kim Chapter 23...

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Physics 241 Lecture 7 Y. E. Kim September 14, 2010 Chapter 23 September 14, 2010 University Physics, Chapter 23 1

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Review - Electric Potential Energy and Electric Potential positive charge High U (potential energy) Low U negative charge High U Low U High V (potential) Low V Electric field direction High V Low V Electric field direction
University Physics, Chapter 23 September 14, 2010 3 If a charged particle moves perpendicular to electric field lines, no work is done If the work done by the electric field is zero, then the electric potential must be constant Thus equipotential surfaces and lines must always be perpendicular to the electric field lines Review Equipotential Surfaces and Lines V   W e q 0 V is constant 0 if W qE d d E

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University Physics, Chapter 23 September 14, 2010 4 Calculating the Potential from the Field Work dW done on a particle with charge q by a force F over a displacement ds : Work done by the electric force on the particle as it moves in the electric field from some initial point i to some final point f Potential difference: Potential: dW F ds qE ds f i W qE ds f e f i i W V V V E ds q     (Convention: i = , f = x) ( ) x V x E ds