A hollow spherical shell of radius r has a uniform charge density σπ. It is kept in a cube of edge 3r such that the centre of the cube coincides with the centre of the shell. The electric flux that comes out of a face of the cube is
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a
2r2σ3ε0
b
r2σ3ε0
c
4r2σ3ε0
d
r2σ6ε0
answer is A.
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Detailed Solution
flux from each surface of the cube is Q6ε0=4πr2σ6ε0=2r2σ3ε0
A hollow spherical shell of radius r has a uniform charge density σπ. It is kept in a cube of edge 3r such that the centre of the cube coincides with the centre of the shell. The electric flux that comes out of a face of the cube is