The field potential inside a charged ball of radius $R$ and centre at $O$ depends only on distance from its centre as $V\left(r\right)=\alpha r^2+\beta$ when $\alpha , \beta$ are $+ve$ constant. Now choose correct options

Two non-conducting spheres of radii $R_1$ and $R_2$ and carrying uniform volume charge densities $+\mathrm{\rho }$ and $-\mathrm{\rho }$, respectively, are placed such that they partially overlap, as shown in the figure. At all points in the overlapping region