A solid conducting sphere of radius `a` has a net positive charge `2Q`. A conducting spherical shell of inner radius `b` and outer radius `c` is concentric with the solid sphere and has a net charge `-Q`. The surface charge density on the inner and outer surfaces of the spherical shell will be

Options

A. `-(2 Q )/(4 pi b^(2) ) , ( Q)/(4pi c^(2))`
B. `-(Q)/(4pi b^(2)),(Q)/(4pi c^(2))`
C. `0,(Q )/(4pi C^(2))`
D. None of the above

Answer

A

Explanation

Surface charge density `(sigma ) = ("Charge ")/("Surface area ")`
` "So" sigma _("inner ") = (-2 Q) /( 4 pi b^(2)) `
` and sigma _(" onter ") =(Q)/(4 pi C^(2))`
` (##NEET_MJT_6_E01_006_S01.png" width="80%">