In finding the electric field using Gauss Law the formula vector |E| = (qenc/ε0 |A|) is applicable. In the formula ε0 is permittivity of free space, A is the area of Gaussian surface and qenc is charge enclosed by the Gaussian surface. The equation can be used in which of the following situation?
(1) Only when the Gaussian surface is an equipotential surface.
(2) Only when vector |E| = constant on the surface.
(3) For any choice of Gaussian surface.
(4) Only when the Gaussian surface is an equipotential surface and vector |E| is constant on the surface.