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Bob LaMontagne wrote:
>
> Whoa!
>
> David Rutherford wrote:
>
> >
> >
> > W = \int{q*(-d(phi)/dr)*dr}
> >
> > or
> >
> > W = \int{q*(-d(phi)}
> >
>
> IMHO - The scond equations is incorrect! - because the second dr
in the first
> equation is 0.
Please check your local calculus book
(d(phi)/dr)dr = d(phi)