Question

what is the meaning of ferro - magnetism and dia - magnetism?

Answer 1

Ferromagnetic substance are which have unpaired electrons due to which they have permanent dipole moment ,as in case of paramagnetic substances.This type of magnetism is called ferromagnetism.

Diamagnetic substances are those in which the individual atom do not posses any net magnetic moment on their own.This type of magnetism is called Diamagnetism.