CHILD DEVELOPMENT PEDAGOGY

Detailed explanation-1: -Ferromagnetism refers to the phenomenon by which ferromagnetic metals such as iron, nickel, cobalt and certain alloys become magnetized in a magnetic field and retain their magnetism when the field is removed.

Detailed explanation-2: -Assertion :Iron, cobalt, nickel and CrO2 are called ferromagnetic substances. Reason: Ferromagnetic substances are weakly attracted by magnetic field.

Detailed explanation-3: -Materials that can be magnetized are called ferromagnetic materials. They include iron, cobalt, and nickel. Magnetic domains must be lined up by an outside magnetic field for most ferromagnetic materials to become magnets.

Detailed explanation-4: -Magnetic domain structure is responsible for the magnetic behavior of ferromagnetic materials like iron, nickel, cobalt and their alloys, and ferrimagnetic materials like ferrite. This includes the formation of permanent magnets and the attraction of ferromagnetic materials to a magnetic field.