Question

Mention two characteristic properties of the material suitable for making the core of a transformer.

Answer 1

Hint:In all types of transformer construction, the central iron core is constructed of an extremely permeable material made of thin silicon steel laminates. These thin laminations are mounted together to ensure a minimum of magnetic losses on the necessary magnetic path.

Complete step by step answer:
-The core of the transformer gives a magnetic path to the flow of the channel. The use of highly permeable material (which defines the material's ability to bear flux), as well as enhanced core design methods, helps to provide a desirable, low-reluctance flow path and contain flux lines to the core.
-The two coils are wound to the same iron core in actual transformers. The aim of the iron core is to redirect the magnetic flux produced by the current flowing around the primary coil, so as to connect the secondary coil as much as possible.For the transformer core, a material with higher permeability and lower conductivity is used. High permeability so that the magnetic field can be quickly allowed into it and low conductivity so that the Eddy current strength is lower and thus the losses are lower.
-Such material is steel, is ferromagnetic material and has a high permeability, but it also has a strong conductivity, thus decreasing the conductivity by $4 - 5$ percent of the silicon is applied to it, which is why the main material is called silicon steel.
-There is a certain method called cold rolled grain orientation, in which the position of the grain edge is made parallel to the position of magnetisation, and thus the permeability is further improved. As a result, CRGO STEEL is still used as a transformer heart.

Note:Although high permeability and low conductivity are two of the most important characteristics still other characteristics like high resistivity, high magnetic susceptibility should also be kept in mind.