The black shapes in the figure are closed surfaces. The electric field lines are in red. For which case the net flux through the surfaces is non-zero?

In all cases net flux is non-zero

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Only (c) and (d)

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Only (a) and (b)

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Only (b), (c) and (d)

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Solution

The correct option is C Only (a) and (b)
As charge is enclosed in a, b, so by Gauss's Law there will be a flux enclosed by the given surface.

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If the net electric field flux passing through a closed surface is Zero, then the electric field at the surface will be :

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