Use Gauss's Law for the following: A conductor with cavities is shown in cross-section along with some point charges in the hollow spaces inside. The net charge on the conductor itself, qcond, is given below each figure. Determine the amount of charge on the surface, inside and out, and sketch the charge distribution on the surface. (See picture)

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Ising model of Ferromagnets

The Ising model is one of the easiest and most famous theoretical models for ferromagnetism in statistical mechanics. When a group of atomic spins aligns such that their magnetic moments are pointed in the same direction and produce a strong permanent magnetic moment in macroscopic size, the phenomenon is called ferromagnetism. The relative permeability of these magnets is greater than unity and increasing magnetization with the applied external field. Even in the absence of an external magnetic field, these substances retain spontaneous magnetization. An example of ferromagnets is iron.