Feynman Lectures Volume 3 Equation 9.41

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Discussion Overview

The discussion revolves around the derivation of the last equation in the context of Feynman Lectures Volume 3, specifically from equations 9.39 and 9.40. Participants are exploring the mathematical relationships and substitutions involved in this derivation.

Discussion Character

  • Technical explanation

Main Points Raised

  • One participant expresses confusion about how the last equation is derived from equations 9.39 and 9.40.
  • Another participant suggests performing a substitution and notes that ##\mu\epsilon## is small compared to ##A##, indicating a potential simplification in the derivation.
  • A third participant acknowledges understanding after the clarification, indicating that the explanation helped resolve their confusion.
  • Another participant points out that the right-hand side of the last equation resembles the right-hand side of equation 9.39, suggesting that this similarity may have contributed to the initial confusion and speculates that Feynman may utilize this similarity in subsequent content.

Areas of Agreement / Disagreement

The discussion reflects a mix of confusion and clarification, with some participants providing insights that help others understand the derivation. However, there is no explicit consensus on the derivation process itself.

Contextual Notes

Participants reference specific equations and terms from the Feynman Lectures, which may require familiarity with the material for full comprehension. The discussion does not resolve all aspects of the derivation, leaving some assumptions and steps unaddressed.

vappole
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I don't understand how the last equation in the attached picture is derived from equations 9.40 and 9.39, can anyone help?
 

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Do the substitution as described and use the fact that ##\mu\epsilon## is small compared with ##A##.
The last equation is for the LHS only of eq.9.39 ... where ##C_I## is given in the first equation in 9.40.
 
Last edited:
Oh, I got it. Tx
 
No worries - the RHS in the last equ. looks a lot like the RHS in equ.9.39 so I expect that's what threw you. I suspect that Feynman exploits the similarity on the next page.
 

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