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A solid metallic sphere has a charge +3Q...

A solid metallic sphere has a charge `+3Q`. Concentric with this sphere is a conducting spherical shell having charge `-Q`. The radius of the sphere is `a` and that of the spherical shell is `b(bgta)` What is the electric field at a distance `R(a lt R lt b)` from the centre

A

`(Q)/(2piepsilon_(0)R)`

B

`(3Q)/(2piepsilon_(0)R)`

C

`(3Q)/(4piepsilon_(0)R)`

D

`(4Q)/(2piepsilon_(0)R^(2)`

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