Question

what is the use of gaussian surface​

Answer 1

A spherical Gaussian surface is used when finding the electric field or the flux produced by any of the following: a point charge. a uniformly distributed spherical shell of charge. any other charge distribution with spherical symmetry.

Answer 2

Answer:

The expression for electric field intensity can be obtained by applying Coulomb's law only in simple cases. In the situations, where Coulomb's law or principle of superposition cannot be applied to calculate the electric field, the same is achieved by using Gauss' law.

For this, one has to evaluate the surface integral. So that surface integral can be evaluated easily, a closed surface is chosen cleverly around the charge distribution. The surface so chosen is called the Gaussian surface.