Question

isolated metal sphere has radius r. when charged to potential v the charge on the sphere is q state an expression in trems of r q for potential V of sphere.

Answer 1

google for capacitance of isolated sphere.

Answer 2

I dont understand at that .will you help me ?

Answer 3

Initial charge does does not matter.
Potential of metal sphere at any instant is given by
V=k*q/r -------->k=1/(4*pi*epsilon_naught)
=>q = V*r/k

Answer 4

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capsph.html