Two point charges with charge +10 pc and-5 pc are separated by 15 m. calculate the potential at a point a that is 1 m from the positive charge on the line between the two charges a. b. calculate the position on the line between the charges at which the potential is zero c. calculate the potential at a point b that is 1 m from the negative charge on the line between d. explain, in terms of the work done by the electric field, what would happen to the potential the two charges energy of a test charge if it was moved from point b to point a. recall the test charges are always positive.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

Ithink they do have the same properties just in less quantities i think