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
Diffcult
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D
all of the above
d
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