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A charge \( Q \) is distributed over two concentric hollow spheres of radii \( r \) and
\( \mathrm{P} \) \( R(Rr) \) such that the surface densities are equal. Find the potential at the

W common centre.
(B) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{Q(R-r)}{R^{2}+r^{2}} \)
(A) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{Q(R+r)}{R^{2}+r^{2}} \)
(D) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{Q(R+r)^{2}}{R^{2}+r^{2}} \)
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