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explain gauss thearom

The total of the electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity.

Gauss' law can be explained in integral form as 

The area integral of the electric field over any closed surface is equal to the net charge enclosed in the surface divided by the permittivity of space. Gauss' law is a form of one of Maxwell's equations, the four fundamental equations for electricity and
magnetism.Gauss' law permits the evaluation of the electric field in many practical situations by forming a symmetric Gaussian surface surrounding a charge distribution and evaluating the electric flux through that surface.

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