In finding the electric field using Gauss Law the formula $\left| {\overrightarrow E } \right| = {{{q_{enc}}} \over {{\varepsilon _0}\left| A \right|}}$ is applicable. In the formula ${{\varepsilon _0}}$ 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?

Question

In finding the electric field using Gauss Law the formula $\left| {\overrightarrow E } \right| = {{{q_{enc}}} \over {{\varepsilon _0}\left| A \right|}}$ is applicable. In the formula ${{\varepsilon _0}}$ is permittivity of free space, A is the area of Gaussian surface and q_enc is charge enclosed by the Gaussian surface. The equation can be used in which of the following situation?

Only when $\left| {\overrightarrow E } \right|$ = constant on the surface.

For any choice of Gaussian surface.

Only when the Gaussian surface is an equipotential surface.

Only when the Gaussian surface is an equipotential surface and $\left| {\overrightarrow E } \right|$ is constant on the surface.

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