Question

Write two examples of ferromagnetic substances.

Answer 1

Hint : Hint: Ferromagnetic substances have a strong magnetic property. Some metals and a number of their alloys, got strongly magnetized in the direction of the external magnetic field. Ferromagnetic substances never lose their magnetic property even if the external magnetic field is removed.

Complete step by step solution: Ferromagnetic materials are substances that are strongly attracted by an external magnetic field and these substances have magnetic properties even when the external magnetic field is removed. These substances behave like a magnet after the removal of an external magnetic field.
Iron, nickel, cobalt, gadolinium are some metals from transition elements groups which are ferromagnetic substances.
Iron and nickel are two examples of ferromagnetic materials.

Additional Information: When ferromagnetic substances are heated at high temperature they transform to paramagnetic substances. The temperature at which ferromagnetic substances are converted into paramagnetic substances is known as Curie temperature.
Permeability of ferromagnetic substances is greater than 1. When the applied magnetic field is removed the body acts as a permanent magnet thus making ferromagnetic suitable for making magnets.

Note: Ferromagnetic substances are those in which each individual atom/molecule/ion has a non zero magnetic moment, as in a paramagnetic substance.
They have a strong tendency to move from a region of weak magnetic field to the region of strong magnetic field, i.e. they get strongly attracted to a magnet.
Relative magnetic permeability and susceptibility is very large. That is why they can be magnetized easily and strongly.
Ferromagnetic substances never lose their magnetic properties after the removal of external fields as paramagnetic substances and diamagnetic substances lose.