Final answer:
A ferrite is a non conductor with magnetic properties used in electromagnetic applications due to its ability to retain magnetic domains with minimal electrical conductivity.
Step-by-step explanation:
A ferrite is best described as (b) a non conductor with magnetic properties. Ferrites are generally ceramic compounds consisting of iron oxide and one or more additional metallic elements. They are commonly used in electromagnetic applications such as inductors and transformers because of their magnetic properties.
These materials exhibit magnetism due to the magnetic domains within them that act like tiny magnets with their own electric current. Unlike ferromagnetic metals like iron or nickel, which can be permanently magnetized, ferrites typically have low electrical conductivity and therefore do not conduct electricity well, which helps to reduce energy losses due to eddy currents in high-frequency applications.