1.

A charge .q.is distrubuted over two concertric hollow conducting sphere of radii r and R (lt r) such that their surface charge densite are equal. The potential at their common centre is

Answer»

ZERO
`(q)/(4piepsilon_(0))((r+R))/((r^(2)+R^(2))^(2))`
`(q)/(4piin_(0))[(1)/(r)+(1)/(R)]`
`(q)/(4piin_(0))[(r+R)/((r^(2)+R^(2)))]`

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