Write any four properties of ferromagnetic materials and give an example for it.

Explanation

Properties of ferromagnetic materials are
Ferromagentic materials are strongly attracted by magnets
When a ferromagnetic material is placed in the non-uniform magnetic field it moves or tend to move from a region of weaker magnetic field to the region of stronger magnetic field.
When a ferromagnetic material is placed in the magentic field, the magnetic field lines prefer to pass through the material rather than through air as show in fig (1)

When a rod of ferromagnetic material is freely suspended in a magnetic field, it quickly points in the direction of applied field as shown in the fig (2)

They obey Curie.s law above curie temperature
Their magnetization is large and positive
Their relative permeability is much more than 1 (`because mu_( r )=1+chi` where `chi` is low and positive)
Their susceptibility is high and positive
Ex: Iron, Cobalt, Nickel. etc.,