1. The problem statement, all variables and given/known data 1000 spherical water droplets, each of radius rand each carrying a charge q, coalesce to form a single bigger spherical drop. If v is the electric potential of each droplet and V that of bigger drop, then find \fracV/v 2. Relevant equations As water is a good conductor of electricity so charges on it will be distributed on the surface.So water droplet can be regarded as spherical shell Potential due to spherical shell is kq/r. where k is constant and q is charge on the shell and r is the distance between the centre of spherical shell and point on which P is to be calculated 3. The attempt at a solution I am unable to understand what is meant by the potential of water droplet.I know potential at a point due to point charge,system of charge and due to continuous charge distribution.But they are calculated at point,I mean we calculate potential at point due to different charge distributions.How can we calculate potential of a body! I want to know what is meant by( " v is the electric potential of each droplet" )this line of the question. In thus problem any specific point is not mentioned. I started like this potential of smaller drop kq/r potential of bigger drop k1000q/r What value of should we take.