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  4. The total electric flux through a cube when a charge 8q is placed at one corner of the cube is

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Q. The total electric flux through a cube when a charge 8q is placed at one corner of the cube is

KEAMKEAM 2009Electric Charges and Fields

Solution:

Given, $Q=8 q$ (at corner of cube)
since, $\phi$ cat corner of cube) $=Q / 8 \epsilon_{0}$
$\phi=\frac{8 q}{8 \epsilon_{0}} $
$\Rightarrow \phi=q / \varepsilon_{0}$