Lecture 26 Lecture Notes

# Lecture 26 Lecture Notes - Lec 26 - 13. Mar March1209 9:32...

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Recap: 7.6.4 Power radiated by moving point charge (Griffith 11.2) point charge assume: initially at origin initially at rest => calculate power radiated through sphere of radius r at time => radiation: consider only terms acceleration Lec 26 - 13. Mar March 12 09 9:32 PM Lecture Notes Page 1

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Lamour formula (holds also for moving particle, as long as v << c) 7.7 Radiation Reaction (Griffith 11.2.2 Jackson 2nd Ed Chapter 17) So far: all fields calculated for given sources, e.g. point charge moving along prescribed path Which forces need to act on particle to keep it on its path? => need to consider back reaction of fields onto charges generating the fields [Radiation Reaction] 7.7.1 Force expression: First idea: radiated energy must come from particle But this is wrong! Total Energy: => need to consider change in total field energy! Energy in Radiation + Energy in local fields around charge Second try: Consider situations where particle starts and ends in the => local fields are identical at the beginning and the end
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## This note was uploaded on 07/28/2009 for the course PHYS 441B taught by Professor Norbertlutkenhaus during the Winter '09 term at Waterloo.

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Lecture 26 Lecture Notes - Lec 26 - 13. Mar March1209 9:32...

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