Lect_7_note

# Lect_7_note - Chapter 25 Electric Potential Electrical...

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Chapter 25 Electric Potential

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Electrical Potential Energy ± A test charge experiences a force F = q o E as it is placed in an electric field ± When the charge moves d s, the work done by the electric field is F . d s = q o E . d s ± The potential energy of the charge-field system is changed by
Electric Potential ± The potential energy per unit charge, U / q o , is the electric potential ± The potential is independent of the value of q o ± The potential has a value at every point in an electric field ± The electric potential is o U V q =

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Electric Potential ± The potential is a scalar quantity ± Since energy is a scalar ± As a charged particle moves in an electric field, it will experience a change in potential B A o U Vd q == −⋅ Es
Parallel Plates ± If the field is E ± The distance is D ± The potential difference V = V B - V A D

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Electric Potential for two Parallel Plates AB q D q ± Potential difference V= -{Work}/q ± Work =F D =qE D ± Potential difference V= -E D
Electric Potential Energy ± Because q o E is conservative, the line integral does not depend on the path taken by the charge ± Animation ± Animation

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## This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lect_7_note - Chapter 25 Electric Potential Electrical...

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