I need help understanding why 4V is the answer to this problem. Eight isolated i

Question

I need help understanding why 4V is the answer to this problem.
Eight isolated identical spherical raindrops are each at apotential V. They coalesce to form a single spherical drop. The potential of the single drop will be? 4V
I dont understand this...please help
Eight isolated identical spherical raindrops are each at apotential V. They coalesce to form a single spherical drop. The potential of the single drop will be? 4V
I dont understand this...please help I need help understanding why 4V is the answer to this problem.
Eight isolated identical spherical raindrops are each at apotential V. They coalesce to form a single spherical drop. The potential of the single drop will be? 4V
I dont understand this...please help

Explanation / Answer

For radius = r, charge = q for each drop, V = q/4r => Total charge being 8q, Volume remaining same, New radius = R, => 4R3 =8*4r3 => R = 2r => V' = 8q/4R = 4q/4r =4V

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