lecture 05 F2011

# lecture 05 F2011 - Lecture 5 C hapters21and22 Page 1...

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Lecture 5 Chapters 21 and 22 Page 1 CALCULATE the potential difference (or just ‘potential’) when moving a positive charge  q against a uniform external electric field (in general):    E ext Beginning with change in potential energy  PE NEW NOTATION:   PE = U = U AB = U B - U A Positive charge q “slows down” as it moves to B b/c kinetic energy changes to potential energy (up hill).

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Lecture 5 Chapters 21 and 22 Page 2 Positive charge q “speeds up” as it moves to B b/c potential energy changes to kinetic energy (down hill). A 12 volt battery does 12 J of work in moving a 1 coulomb charge  between terminal.
Lecture 5 Chapters 21 and 22 Page 3 Problem:    An electron with an initial speed of 500,000 m/s is brought to rest by an electric field. a. Did the electron move into a region of higher potential or lower potential? Explain. b . Calculate the potential difference that stopped the electron.

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Lecture 5 Chapters 21 and 22 Page 4 When calculating potential difference consider type of system or geometry.
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## This note was uploaded on 01/10/2012 for the course PHYS 2114 taught by Professor Bandy during the Spring '08 term at Oklahoma State.

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lecture 05 F2011 - Lecture 5 C hapters21and22 Page 1...

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