An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is obseved that the inner face of the carries a uniform charge density -sigma and the surface carries a uniform charge density .sigma. If a point charge q_(A) is placed at the center of the shell, then choose the correct statement(s)

An empty thick conducting shell of inner radius a and outer radius b i

1.	An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is obseved that the inner face of the carries a uniform charge density -sigma and the surface carries a uniform charge density .sigma. If a point charge q_(A) is placed at the center of the shell, then choose the correct statement(s)
Answer» The charge MUST be positive The charge must be negative The magnitude of charge must be `4PI sigma a^(2)` The magnitude of charge must be `4pi sigma(B^(2) - a^(2))` Answer :C

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