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 

(1) 2Q4πb2,Q4πc2

(2) Q4πb2,Q4πc2

(3) 0,Q4πc2

(4) None of the above

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Concept Questions :-

(1) Surface charge density (σ) =ChargeSurface area

So σinner=2Q4πb2 and σOuter=Q4πc2 

Difficulty Level:

  • 48%
  • 20%
  • 25%
  • 9%