Q 1525191061.     Two concentric hollow spherical shells have radii `r` and `R (R > > r)`. A charge `Q` is distributed on them such that the surface charge densities are equal. The electric potential at the centre is:

EAMCET 2014
A

`\frac{Q(R+r)}{4\pi\epsilon_0(R^2+r^2)}`

B

`\frac{Q(R^2+r^2)}{4\pi\epsilon_0(R+r)}`

C

`\frac{Q}{R+r}`

D

`0`

HINT

` \sigma=\ frac{q}{4\pi r^2}` `V= 1/(4piepsilon_0)xxq/r`

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