Place 9 equal point charges on vertices of a degudas no nagon (9-8 ided plygon). a)- what placel at the Centse of this nomagon ? b)- If the charge at one of vertices of nonagon ů Henoved , what net fore would be exferinced by tat chage at center ? Explaon Anguef will be net force on a test charge d

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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.