Why is the electric field inside a conductor zero?

Answer: There are no charges inside the conductor; they only exist on the conductor’s outside. Gauss’s law can therefore be used to conclude that the conductor has no electric field.

According to Gauss’s law, the total electric flux passing through a fictitious closed surface is always equal to (1/ε0) time the net charge it is enclosing. The rate at which the electric field is moving across the specified area is known as the electric flux. The electric field will stay 0 because there are no electric charges inside the wires.