ABSTRACT
A magnet is such an integral part of world that it is natural to expect thermodynamics to play a role in its description, or more generally, in the description of magnetic systems. That temperature has a central role to play in magnetism is revealed by the fact that magnets lose their magnetism when heated. Magnetic materials can be in the form of solids, liquids, as well as gases. According to their magnetic properties, to be explained shortly, they are classified as the so called Diamagnetic, Paramagnetic and Ferromagnetic substances. The chapter discusses an analysis of the situation when a magnetic material is placed inside the solenoid. The situation becomes quite complex and indicate in broad terms the resulting picture. The solenoid not only produces a magnetic field everywhere, it also induces a magnetization in the magnetic body.
