MCQ
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)
- AThe potential of both the inner and outer surface of the shell becomes zero
- BCharge on the outer surface becomes zero
- CPositive charge flows from the shell to the earth
- ✓all of the above

