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A charge Q is distributed over three con...

A charge Q is distributed over three concentric spherical shells of radii a, b, c (a`lt` b `lt` c) such that their surface charge densities are equal to one another.
The total potential at a point at distance r from their common centre, where r`lt`a, would be :

A

`(Q)/(12piin_(0))(ab+bc+ca)/(abc)`

B

`(Q(a^(2)+b^(2)+c^(2)))/(4piin_(0)(a^(3)+b^(3)+c^(3)))`

C

`(Q)/(4piin_(0)(a+b+c))`

D

`(Q(a+b+c))/(4piin_(0)(a^(2)+b^(2)+c^(2)))`

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