A disk of radius acarries a nonuniform surface charge density given by \sigma = \sigma _0 \frac{r}{a} where \sigma _0 is a constant.
If you know that the potential at an arbitrary point on thedisk axis, a distance xfrom the disk center is
Part One:
Use this result to find the electric field on the diskaxis.
Express your answer in terms of thevariables x,\sigma_0, a.
Do not put it in terms of k andr.
Part Two:
breafly show me that how the fieldreduces to an expected form for x \gg a.

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