$A$ positive charge $Q$ is situated at the centre of a cube. The electric flux through any face of the cube is (in $SI$ units)
- A$\frac{Q}{6 \varepsilon_{0}}$
- B$4 \pi Q$
- C$\frac{Q}{4 \pi \varepsilon_{0}}$
- D$\frac{Q}{6 \pi \varepsilon_{0}}$
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