Class 041 - Electric Potential

Class 041 - Electric Potential - W = force . displacement W...

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Electric Potential, Potential Energy What You Will Learn Today • How to determine potential difference using energy conservation? • What is electric potential in some specific conditions? Preparation for next class • Read 21.1 – 21.5 • Make progress on Homework: Chapter 21a • Start studying for Friday’s test! • Bring your workbook to next class!
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Practice Problem As a proton flies towards a fixed charge, it slows down from 6.6x10 5 m/s to 2.5x10 m/s. a. Is the fixed charge positive or negative? b. How much kinetic energy does the proton lose? c. How much potential energy does the proton gain? d. What is the potential difference ( V f i ) between the two points? Mass of a proton: m p = 1.7x10 -27 kg Charge of a proton: q = 1.6x10 -19 C
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Potential in Parallel Plate Capacitor Moving a proton from negative the plate over a distance x:
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Unformatted text preview: W = force . displacement W = qE . x = U elec V = U /q = Ex = Qx/( A) What do equipotential lines look like? How are equipotential lines and field lines related? Field lines are perpendicular to equipotential lines Field lines point toward lower potential Field is stronger where equipotential lines are closer together 100 V 50 25 75 Potential Map for a Point Charge As we approach the fixed charge: Work required to move a charge increases Therefore, potential energy difference and potential difference also increase Potential Map and Field Lines Preparation for Next Class Read 21.1 21.5 Make progress on Homework: Chapter 21a Start studying for Fridays test Bring your workbook to next class!...
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This note was uploaded on 10/15/2011 for the course PHYS 1112 taught by Professor Rameshmani during the Spring '10 term at Georgia State University, Atlanta.

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Class 041 - Electric Potential - W = force . displacement W...

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