4.1 point charges q, = 1 nc and q2 = 2 nc are at a distance apart. which of the following statements are incorrect? (a) the force on ql is repulsive. (b) the force on q2 is the same in magnitude as that on qx. (c) as the distance between them decreases, the force on ql increases linearly. (d) the force on q2 is along the line joining them. (e) a point charge q3 = — 3 nc located at the midpoint between q{ and q2 experiences no net force

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 -