A point charge $q$ is placed at a distance $\frac{a}{2}$ directly above the centre of a  square of side $a$ . The electric flux through the square is

  • A

    $\frac{q}{\in_0}$

  • B

    $\frac{q}{\pi \,\in_0}$

  • C

    $\frac{q}{4\, \in_0}$

  • D

    $\frac{q}{6 \,\in_0}$

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