Two isolated metallic solid spheres of radii R and 2 R are charged such that both have same charge density σ. The spheres are then connected by a…

Two isolated metallic solid spheres of radii $\displaystyle R$ and $\displaystyle 2$ R are charged such that both have same charge density $\displaystyle \sigma$. The spheres are then connected by a thin conducting wire. If the new charge density of the bigger sphere is $\displaystyle \sigma^{\prime}$. The ratio $\displaystyle \frac{\sigma^{\prime}}{\sigma}$ is :