I hope and pray we are talking about buoys and not boys.
Anyway, here is a solution for totally immersed spheres. If the sphere waterlines are halfway down the sphere, then double the resistance. (you have half as much conductance)
http://www.df.unipi.it/~macchi/TEACHING/FISICA2/PROBLEMS/twospheresistance.pdf
two spherical boys float half some edge in a calm deep sea their radius a, is very much small er than their separation b, calculate the resistance between them If the resistivity of the is rho water
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