If the electric field intensity of each point on a closed surface is zero, then the total electric field intensity zhi flux of the whole surface must be zero, and according to Gauss's law, the algebraic sum of the internal charges of the closed surface must also be zero.
If the electric field intensity of each point on the closed surface is zero, then the electric flux must be zero, and the total charge on the surface must be zero. This is the Gauss theorem, a very magical theorem. It's amazing, because the other way around is wrong. The following sentence is correct: the total charge in the plane is zero, and the electric field intensity of each point on the closed surface is not necessarily zero.
Extended data
The electric field strength follows the principle of field strength superposition:
That is, the total spatial field strength is equal to the vector sum of the field strengths when each electric field exists alone, that is, the principle of field strength superposition is an experimental law, which shows that each electric field acts independently and is not affected by the existence of other electric fields.
The intensity of electric field is related to the bearing capacity of insulating materials everywhere in electrical equipment, the current density in conductive materials, the voltage on terminal buttons and whether corona and flashover occur, which is one of the important physical quantities to be considered in design.
The electric field intensity near the surface of the earth is about100 v/m. ..