A spherical shell with an inner radius $'a'$ and an outer radius $'b'$ is made of conducting material. A point charge $+Q$ is placed at the centre of the spherical shell and a total charge $-q$ is placed on the shell. Final charge distribution on the surfaces as

814-638

  • A

    $-Q$ on inner surface, $-q$ on outer surface

  • B

    $-Q$ on inner surface, $(-q +Q)$ on outer surface

  • C

    $+Q$ on the inner surface, $(-q\,-Q)$ on the outer surface

  • D

    The charge $-q$ is spread uniformly between inner and outer surface

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  • [KVPY 2016]