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(c) A circular conducting disk of radius

`R`

carries a total charge

`Q`

. In Prob. 2.58a you showed that the charge density is

`\sigma (r)=(Q)/(2\pi R)(1)/(\sqrt(R^(2)-r^(2))).`

Find the potential of the disk. (d) Use your result in (c) to calculate the energy of a conducting disk of radius

`R`

and total charge

`Q`

. Compare your answer to (b); which is smaller, and why??2