Two charged spherical conductors of radius `` R _{1} `` and `` R _{2} `` are connected by a wire. Then the ratio of surface charge densities of the spheres `` \left(\sigma_{1} / \sigma_{2}\right) `` is
(A) `` \frac{R_{1}}{R_{2}} ``
(B) `` \frac{R_{2}}{R_{1}} ``
(C) `` \sqrt{\left(\frac{ R _{1}}{ R _{2}}\right)} ``
(D) `` \frac{ R _{1}^{2}}{ R _{2}^{2}} ``