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Q = 350 u.e.s (1 C / 2.995 X 10⁺⁹ C) = 1.168 x 10⁻⁷ C
r = 25 cm = 0.25 m
k = 9 x 10⁺⁹ N m² / C²
V = ?
Formula
V = K Q / r
V = (9 x 10⁺⁹ N m² / C²)(1.168 x 10⁻⁷ C) / (0.25 m) = 4204.8 V