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4) A disk of radius R with a hole of radius r is uniformly charged with charge density o.
a) Determine the potential at point P at a distance z from the center of the ring on the ring's
axis.
b) Calculate the value of the potential if R = 0.130m, r = 0.200R, o =
6.20pC/m², and
z = 2.00R.
Po
R

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