Which of the following could be true for a Gaussian surface through which the net flux is zero? I. There are no charges inside the surface. II. The net charge enclosed by the surface is zero. III. The electric field is zero everywhere on the surface.

I & II

Explanation: gauss law states that the total amount of electric flux through a closed surface equals the net electric charge enclose divided by permittivity of free space.

Φ = ∫E. dA = Q/ε0

Φ = electric flux

ε0 = permittivity of free space

E= strength of electric field.

dA = fraction of area that flux passes through.

Q = net charge enclosed.

Hence a zero net flux is only possible when the net charge is equals to zero and when there is no charge in the enclosed surface.

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