If the amount of electric flux entering and leaving a closed surface are \phi_{1} and \phi_{2} respectively. What is the electric charge inside the surface?
If the amount of electric flux entering and leaving a closed surface are \phi_{1} and \phi_{2} respectively. What is the electric charge inside the surface?

Ans: Net flux can be given as =\phi_{2}-\phi_{1}
Since \phi=\frac{q}{\epsilon_{0}}

    \[\Rightarrow \mathrm{Q}=\left(\phi_{2}-\phi_{1}\right) \in_{0}\]

The electric charge inside the surface can be given as:

    \[\Rightarrow \mathrm{Q}=\phi \epsilon_{0}\]