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  4. 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 />

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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
image

KVPYKVPY 2017Electric Charges and Fields

Solution:

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.