A spherical drop of water carrying a charge of 11 pc has a, Ask an Expert

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A spherical drop of water carrying a charge of 11 pC has a potential of 590 V at its surface (with V = 0 at infinity).

(a) What is the radius of the drop?

(b) If two such drops of the same charge and radius combine to form a single spherical drop, what is the potential at the surface of the new drop?

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