derivative with respect to a variable

ahjukhir

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.
Thanks!

tiny-tim

Hi ahjukhir! Welcome to PF!

(try using the X² tag just above the Reply box

)

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

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ahjukhir	derivative with respect to a variable Tweet 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. Thanks!

tiny-tim Blog Entries: 27 Recognitions: Gold Member Homework Help Science Advisor	Hi ahjukhir! Welcome to PF! (try using the X² tag just above the Reply box ) Hint: there's a special trick for this … rewrite D^-r/p as (e^ln(D))^-r/p = e^-(r/p)ln(D)