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Two concentric spheres of radii a and b ...

Two concentric spheres of radii `a` and `b` have a space in between the spheres which is filled with a material of resistivity `rho`. Resistance of the intermediate material is

A

`rho/(4pi) [1/a^2-1/b^2]`

B

`rho/(4pi)(b-a)/(ab)`

C

`rho/(4pi)[1/b-1/a]`

D

`rho^2/(4pi)[1/a-1/b]`.

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