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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 apherical shell is `b (gt a)`. What is the electric field at a distance `r(a lt r lt b)` from the centre ?

A

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

B

`(3Q)/(4piepsilon_(0)R^(2))`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
B

`E_(p)=(3Q)/(4 pi in_(0) R^(2))`
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