The black shapes in the figure below are closed surfaces. The electric field lines are in red. For which case, the n et flux through the surfaces is non-zero

Question

The black shapes in the figure below are closed surfaces. The electric field lines are in red. For which case, the n et flux through the surfaces is non-zero <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/14076f0b8e5e4fb8c9d50294ee2a9f25-.png" /> (A) In all cases net flux is non-zero (B) For III and IV cases (C) For I and II cases (D) For II, III and IV cases

Tardigrade Admin · Accepted Answer

Flux through a closed surface is non-zero only, when charge is enclosed by the surface. So, net flux through III and IV is zero.

Q. The black shapes in the figure below are closed surfaces. The electric field lines are in red. For which case, the n et flux through the surfaces is non-zero

In all cases net flux is non-zero

For III and IV cases

For I and II cases

For II, III and IV cases

Flux through a closed surface is non-zero only, when charge is enclosed by the surface. So, net flux through III and IV is zero.