An insulating solid sphere of radius R has uniform positive volume charge density and total charge Q. Find the electric potential at a point outside the sphere, at a distance r from the center of the sphere. Coulomb constant is given by \({{k}_{e}}=\frac{1}{4\pi {{\varepsilon }_{0}}}\)
1
\(-\frac{{{k}_{e}}Q}{r}\)
2
\(-\frac{{{k}_{e}}{{Q}^{2}}}{r}\)
3
0
4
\(\frac{{{k}_{e}}Q}{r}\)