A charge $q$ is placed at the centre of cubical box of side a with top open. The flux of the electric field through one of the surface of the cubical box is 

  • A

    zero

  • B

    $q/{\varepsilon _0}$

  • C

    $q/{6\varepsilon _0}$

  • D

    $5q/{6\varepsilon _0}$

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