Auniformly polarized dielectric sphere with a radium r=a is located at the origin and has an internal permanent polarization, p = po z , that is pointed along the +z-direction with a magnitude, po. similar to ferromagnetic materials that maintain their internal magnetization even when external magnetic fields are shut off, these ferroelectric materials will maintain their polarization fields in the absence of an external electric field, eext=0, for all parts of this question. 1.1.1. find the volume, ps(r), and surface, os(r), bound charge distributions in this ferroelectric material. [10 pts) 1.1.2.find the displacement field, d(r), both inside (ra) the ferroelectric sphere.

Large buildings with barreled shaped roofs covered in bark made by native americans and other peoples across the world were considered "longhouses" in the americas. these longhouses were permanent structures that housed many families of the same clan in a singular building. 

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 -