Gauss's law is given by ${\epsilon _0}\oint {\vec E \cdot d\vec s} = q$. If the net charge enclosed by a Gaussian surface is zero,then .......

  • A
    $E$ must be zero on the surface.
  • B
    The number of electric field lines entering the surface must be equal to the number of electric field lines leaving it.
  • C
    There is a net influx of electric field lines.
  • D
    None of the above.

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