A thin disk of radius (R=62.5 mathrm{~mm}) has uniform surface charge density (sigma=7.5 mathrm{nC} / mathrm{m}^{2}). Calculate

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A thin disk of radius \(R=62.5 \mathrm{~mm}\) has uniform surface charge density \(\sigma=7.5 \mathrm{nC} / \mathrm{m}^{2}\). Calculate the potential on the axis of the disk at distances

(a) 5.0 mm

(b) 30 mm, and 

(c) 62. 5 mm from the disk.

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