An empty thick conducting shell of inner radius $a$ and outer radius $b$ is shown in figure.If it is observed that the inner face of the shell carries a uniform charge density $-\sigma$ and the surface carries a uniform charge density $ '\sigma '$

If the inner surface of the shell is earthed, then identify the correct statement(s)

  • A

    The potential of both the inner and outer surface of the shell becomes zero

  • B

    Charge on the outer surface becomes zero

  • C

    Positive charge flows from the shell to the earth

  • D

    all of the above

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