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