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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
strong                                                                                                                                                                   [AMU 2002]/strong
 
(a) \( -\frac{2 Q}{4 \pi b^{2}}, \frac{Q}{4 \pi c^{2}} \)                                                                               (b) \( -\frac{Q}{4 \pi b^{2}}, \frac{Q}{4 \pi c^{2}} \)
 
(c) \( 0, \frac{Q}{4 \pi c^{2}} \)                                                                                     (d) None of the above
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