If on the concentric hollow spheres of radii $r$ and $R( > r)$ the charge $Q$ is distributed such that their surface densities are same then the potential at their common centre is
If on the concentric hollow spheres of radii $r$ and $R( > r)$ the charge $Q$ is distributed such that their surface densities are same then the potential at their common centre is
- A
$\frac{{Q({R^2} + {r^2})}}{{4\pi {\varepsilon _0}(R + r)}}$
- B
$\frac{{QR}}{{R + r}}$
- C
Zero
- D
$\frac{{Q(R + r)}}{{4\pi {\varepsilon _0}({R^2} + {r^2})}}$
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