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An empty thick conducting shell of inner...

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)

A

The charge must be positive

B

The charge must be negative

C

The magnitude of charge must be `4pi sigma a^(2)`

D

The magnitude of charge must be `4pi sigma(b^(2) - a^(2))`

Text Solution

Verified by Experts

The correct Answer is:
C
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