A charge q is enclosed in a cube at its centre, then electric flux associated with two opposite faces of the cube is

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A charge q is enclosed in a cube at its centre, then electric flux associated with two opposite faces of the cube is

(a) $\frac{q}{3ε_0}$

(b) $\frac{2q}{3ε_0}$

(c) $\frac{q}{6ε_0}$

(d) zero

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Answer is (a) $\frac{q}{3ε_0}$