ch25 - Electrostatic Potential and Energy Chapter Outline...

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1 303L : Electric Potential (Ch.25) ENGINEERING PHYSICS II PHY 303L Chapter 25: Electrostatic Potential and Energy Maxim Tsoi Physics Department, The University of Texas at Austin http://www.ph.utexas.edu/~tsoi 303L : Electric Potential (Ch.25) Electrostatic Potential and Energy Chapter Outline •The electrostatic potential •Calculation of the Potential from the Field •Potential in Conductors •Calculation of the Field from the Potential •Energy of Systems of Charges 303L : Electric Potential (Ch.25) Potential difference and electric potential potential energy of the charge-field system When a charge is displaced by d s , the work done by the electric field is: As work is done by the field, the potential energy of the charge-field system is changed by an amount: For a finite displacement of the charge from A to B the change in potential energy is: The electric force is conservative barb2right the line integral does not depend on the path taken from A to B s d E q s d F r r r r = 0 s d E q dU r r - = 0 - = Δ B A s d E q U r r 0 303L : Electric Potential (Ch.25) Potential difference and electric potential electric potential Electric potential barb2right is a scalar characteristic of an electric field, independent of any charges that may be placed in the field Potential difference barb2right take the value of the electric potential to be zero at some convenient point • The work done by an external agent to move an electric charge q through the field at constant velocity is
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