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  4. Four closed surfaces s1, s2, s3 and s4 together with charges +q,-q and -2 q are shown. Through which one of the surfaces the net flux is zero?

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Q. Four closed surfaces $s_{1}, s_{2}, s_{3}$ and $s_{4}$ together with charges $+q,-q$ and $-2 q$ are shown. Through which one of the surfaces the net flux is zero?Physics Question Image

AP EAMCETAP EAMCET 2020

Solution:

According to given diagram, net charge enclosed through the surface $S_{2}$ is zero. Hence, according to Gauss's law, Net flux through surface,
$S_{2}=\frac{\text { Charge in closed }}{\varepsilon_{0}}=\frac{0}{\varepsilon_{0}}=0$