Question

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

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

Answer 1

The correct option is D $Q/{6\epsilon }_0$

According Gauss's law
total flux$=Q/{\epsilon }_0$
Since cube has six face, so flux coming out through one wall or one face is $Q/6{\epsilon }_0$