Two identical thin rings each of radius \[R\] meters are coaxially placed at a distance R meters apart. If \[{{Q}_{1}}\] coulomb and \[{{Q}_{2}}\] coulomb are respectively the charges uniformly spread on the two rings, the work done in moving a charge\[q\] from the centre of one ring to that of other is

• A. Zero                 
• B. \[\frac{q({{Q}_{2}}-{{Q}_{1}})(\sqrt{2}-1)}{\sqrt{2}.4\pi {{\varepsilon }_{0}}R}\]
• C. \[\frac{q\sqrt{2}({{Q}_{1}}+{{Q}_{2}})}{4\pi {{\varepsilon }_{0}}R}\] 
• D. \[\frac{q({{Q}_{1}}+{{Q}_{2}})(\sqrt{2}+1)}{\sqrt{2}.4\pi {{\varepsilon }_{0}}R}\]