\({F_{CP}}\,\, = \,\,{F_e}\,\, \Rightarrow \,\,\,\,\,\frac{{m{v^2}}}{R}\,\,\, = \,\,\frac{{kQq}}{{{R^2}}}\,\, \Rightarrow \,\,v\,\, = \,\sqrt {\frac{{kQq}}{{mR}}} \)

\(⇒\)આવર્તકાળ \({\text{T}}\,\, = \,{\text{ }}\frac{{{\text{2}}\pi {\text{R}}}}{{\text{v}}}\,\,\, = \,\,\frac{{2\pi R\sqrt {mR} }}{{\sqrt {kQq} }}\,\,\, \Rightarrow \,\,{T^2}\, = \,\,\,\frac{{4{\pi ^2}{R^2}(mR)4\pi \,\,{ \in _0}}}{{(Qq)}}\,\,\, = \,\,\frac{{16{\pi ^3}\,\,{ \in _0}\,\,m{R^3}}}{{Qq}}\)