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Question concerning the direction of the vector r in the FL

  1. Apr 22, 2014 #1
    Hello! I've got a question concerning the direction of the vector r in the Feynman Lectures of Physics in Chapter 13.3 http://www.feynmanlectures.caltech.edu/I_13.html#Ch13-S3

    Which direction does the vector r in equation 13.5 point in?
    The long equation before equation 13.6 suggests that it should point from ##m_{j}## to ##m_{i}##.

    Is that correct?
  2. jcsd
  3. Apr 23, 2014 #2


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    The convention is given in figure 13.2: the vectors point from 1 to 2.
  4. Apr 23, 2014 #3
    Do you mean 13.15 and 13.16?
  5. Apr 23, 2014 #4
    The vector should be the same in both equations.
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