[MP PMT 1994, 95; DCE 1999, 2001; AIIMS 2001]

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Solution

The correct option is A

By Gauss's theorem,
total flux coming out of the cube is $ϕ = \frac{q}{ϵ_{0}}$
A cube has six phases. So, from symmetry, flux coming out through any one = $\frac{q}{6 ϵ_{0}}$

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