1.

A solid metal sphere of radius R has a charg +2Q. A hollow spherical shell of radius 3R placed concentric with the frist sphere has net charge -Q. Find the electric field between the sphere at a distance r from the centre of the inner sphere. [R lt r lt 3R].

Answer»

`(Q)/(2PI epsilon_(0)R^(2))`
`(Q)/(pi epsilon_(0)r^(2))`
`(Q)/(epsilon_(0)r^(2))`
`(Q)/(5PI epsilon_(0)r^(2))`

ANSWER :A


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