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What will be the total flux through the faces of the cube (figure) with side of length a if a charge q is placed at List-I List-II (P) A : a corner of the cube     (1) \frac{q}{2 \left(\in\right)_{0}} (Q) B : mid-point of an edge of the cube (2) \frac{q}{4 \left(\in\right)_{0}} (R) C : centre of a face of the cube  (3) \frac{q}{\left(\in\right)_{0}} (S) D : mid-point of B and C (4) \frac{q}{8 \left(\in\right)_{0}}