**Comments:**

The prerequisites to “Electric field” are “What is a vector” and “Electric charge and Coulomb’s law.” The prerequisites to “Gauss’s law” are “Electric field” and “The inverse square law and the 3-dimensional world.” These articles do not use any complicated math, but we will formulate Gauss’s law mathematically in our later article “Revisiting Gauss’ law and the “derivation” of Coulomb’s law” listed in the section “Maxwell’s equations.”