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1. Electric charges and fields — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics1. Electric charges and fields1 Mark
MCQ
For a given surface the Gauss's law is stated as $\oint {E \cdot ds} = 0$. From this we can conclude that
  • A
    $E$ is necessarily zero on the surface
  • B
    $E$ is perpendicular to the surface at every point
  • ✓
    The total flux through the surface is zero
  • D
    The flux is only going out of the surface
✓

Answer

Correct option: C.
The total flux through the surface is zero
c
(c) The Gauss's law states that the total electric flux coming out from a volume of charges is equal to the charge enclosed times the permittivity of the medium inside the surface.

So if $\int E . d s=0$, it implies that net flux through the surface is zero i.e. there is no charge enclosing that surface.

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