a
\({E_0}\,\, = \,\,kq\,\left[ {\frac{1}{1}\,\, + \,\,\frac{1}{4}\,\, + \,\,\frac{1}{{16}}\, + \,\,.........} \right]\,\, = \,\,\frac{{kq.1}}{{(1\, - \,1\,/\,4)}}\,\, = \,\,\frac{{4kq}}{3}\,\,\,\,\,\,\,\)[\({\because \,\,{S_\infty }\, = \,\,\frac{a}{{1\,\, - \,\,r}}\,,\,\,a\,\, = \,\,1\,}\) અને \({\,r\,\, = \,\,\frac{1}{4}}\)]