A conducting sphere of radius \( R \) and a concentric thick spherical shell of inner radius \( ...

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A conducting sphere of radius \( R \) and a concentric thick spherical shell of inner radius \( 2 R \) and outer radius \( 3 R \) is shown in figure. A charge \( +10 Q \) is given to the shell and inner sphere is earthed. Then charge on inner sphere is
(1) \( -4 Q \)
(2) \( -10 Q \)
(3) zero
(4) none of these
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