Question

At the centre of a cubical box + Q charge is placed. The value of total flux that is coming out a wall is

• A. $Q/{ϵ}_0$
• B. $Q/3{ϵ}_0$
• C. $Q/4{ϵ}_0$
• D. $Q/6{ϵ}_0$

Answer 1

The correct option is D $Q/6{ϵ}_0$

According to Gauss' Law
$\oint E.ds=\frac{Q_{\text{enclosed by closed surface}}}{{ϵ}_0}=flux$
so total $flux=Q/{ϵ}_0$
Since cube has six face, so flux coming out through one wall or one face is $Q/6{ϵ}_0$.