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Derivative with respect to a variable

  1. Sep 6, 2009 #1
    little rusty with my derivatives...

    Question derive Eo with respect to r
    En = -C/r + D^(-r/p)

    C,D and p are all constants...

    so far I have Eo = -Cr^-2 .. but then im not sure about the exponential.

    any help would be appreciated.
  2. jcsd
  3. Sep 6, 2009 #2


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    Welcome to PF!

    Hi ahjukhir! Welcome to PF! :smile:

    (try using the X2 tag just above the Reply box :wink:)

    Hint: there's a special trick for this … rewrite D-r/p as (eln(D))-r/p = e-(r/p)ln(D) :wink:
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