¾ With the modern knowledge about the structure of matter we know that electric charges come from elementary particles: negatively charged electron and positively charged proton. In nuclei there are also neutron with no charge. Interaction between charges: two positive charges or two negative charges repel each other. A positive charge and a negative charge attract each other. This interaction is called the static electric interaction. | A Course of Physics Physics 211 Lecture 1 Pg 1 GENERAL PHYSICS II Electromagnetism Thermal Physics Physics 211 Lecture 1 Pg 2 CHAPTER VII Static Electric Field 1. Electric charges. Coulomb s law 2. Electric field and electric field vector 3. Electric flux and Gauss s law 4. Electric potential Physics 211 Lecture 1 Pg