GEOLOGY

Detailed explanation-1: -Ferromagnets will tend to stay magnetized to some extent after being subjected to an external magnetic field. This tendency to “remember their magnetic history” is called hysteresis. Nickel, iron and cobalt are such materials.

Detailed explanation-2: -Ferromagnetism is a kind of magnetism that is associated with iron, cobalt, nickel, and some alloys or compounds containing one or more of these elements. It also occurs in gadolinium and a few other rare-earth elements.

Detailed explanation-3: -A material can be magnetized if all of its magnetic domains can be aligned. Magnetic domains are regions of matter where north and south poles of atoms line up in the same direction. Only certain materials, called ferromagnetic materials, can be magnetized. They include iron, cobalt, and nickel.

Detailed explanation-4: -Assertion :Iron, cobalt, nickel and CrO2 are called ferromagnetic substances. Reason: Ferromagnetic substances are weakly attracted by magnetic field.

Detailed explanation-5: -Iron. Cobalt. Nickel. 29-Nov-2021