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2. Electric Potential and Capacitance
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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 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 $4\ \pi \sigma a^2$
D
$A$ and $C$ both
Solution
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Standard 12
Physics
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