Ch16_part1

# Ch16_part1 - Chapter 16, Part 1 PHY213, lecture 4 Chapter...

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Chapter 16, Part 1 PHY213, lecture 4 1 Chapter 16 Reading should be 16.6-16.9, NOT 16.7-16.10 HW set #2 (Due Tuesday, June 23 rd ) Ch. 16: CQ-1,3,4,6,7,11 P-1,4,8,15,16,23,26,35,42,46 Ch. 17: CQ-1,2,4,6,10 P-2,6,14,16,19,33,38,42,44 Electric Energy and Capacitance Electric Potential Energy s The electrostatic force is a conservative force s It is possible to define an electrical potential energy function with this force s Work done by a conservative force is equal to the negative of the change in potential energy Work and Potential Energy s There is a uniform field between the two plates s As the charge moves from A to B, work is done on it s W = Fd=q E x (x f – x i ) s ΔPE = - W = - q E x (x f – x i ) s only for a uniform field Potential Difference s The potential difference between points A and B is defined as the change in the potential energy (final value minus initial value) of a charge q moved from A to B divided by the size of the charge s ΔV = V B – V A = ΔPE / q s Potential difference is not the same as potential energy

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Chapter 16, Part 1 PHY213, lecture 4 2 Potential Difference, cont. s Another way to relate the energy and the potential difference: ΔPE = q ΔV s Both electric potential energy and potential difference are scalar quantities s Units of potential difference s V = J/C s A special case occurs when there is a uniform electric field s V = V B – V A = -E x x s Gives more information about units: N/C = V/m Energy and Charge Movements s A positive charge gains electrical potential energy when it is moved in a direction opposite the electric field s If a charge is released in the electric field, it experiences a force and accelerates, gaining kinetic energy s As it gains kinetic energy, it loses an equal
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## This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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Ch16_part1 - Chapter 16, Part 1 PHY213, lecture 4 Chapter...

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