Two connectric spheres of radii `R` and `r` have similar charges with equal surface charge densities `(sigam)`. The electric pot

Two connectric spheres of radii `R` and `r` have similar charges with equal surface charge densities `(sigam)`. The electric potential at their common centre is
A. `sigma/epsi_(0) (R+r)`
B. `sigma/epsi_(0) (R-r)`
C. `sigma/epsi_(0) (1/R+1/r)`
D. `sigma/epsi_(0)(1/R)`

Two connectric spheres of radii `R` and `r` have similar charges with equal surface charge densities `(sigam)`. The electric potential at their common

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