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A metal sphere of radius R carrying char...

A metal sphere of radius R carrying charge q is surrounded by a thick concentric metal shell of inner and outer radii a and b respectively. The net charge on the shell is zero. The potential at the centre of the sphere, when the outer surface of the shell is grounded will be

A

`(q)/( 4pi in_0 ) ((1)/(a) - (1)/(b)) `

B

`(q)/(4 pi in_0) (1)/(a)`

C

`(q)/(4 pi in_0) ((1)/(R )-(1)/(a))`

D

`(q)/(4 pi in_0) (1)/(R )`

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