$(a)\;\large\frac{Q}{\in_{0}}\qquad(b)\;\large\frac{Q}{3 \in_{0}}\qquad(c)\;\large\frac{Q}{6 \in_{0}}\qquad(d)\;\large\frac{Q}{2 \in_{0}}$

Answer : (c) $\;\large\frac{Q}{ 6 \in_{0}}$

Explanation :

Imagine a cube of edge a , enclosing the charge . The square surface is one of the six faces of this cube . According to Gauss's theorem in electrostatics , total electric flux through the cube = $\;\large\frac{Q}{\in_{o}}$

Flux through the square surface = $\; \large\frac{Q}{6\in_{0}}$

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