Question

Which of the following is ferromagnetic?

• A. $\mathrm{Fe},\mathrm{Co},\mathrm{Ni}$
• B. $\mathrm{Cu},\mathrm{Ag},\mathrm{Au}$
• C. $\mathrm{Ca},\mathrm{Sr},\mathrm{Ba}$
• D. $\mathrm{Zn},\mathrm{Cd},\mathrm{Hg}$

Answer 1

The correct option is A

$\mathrm{Fe},\mathrm{Co},\mathrm{Ni}$

Explanation for correct option:

A. $\mathrm{Fe},\mathrm{Co},\mathrm{Ni}$

Ferromangetic material:

• The material that is strongly attracted by a magnetic field is known as Ferromagnetic materials.
• Some examples of ferromagnetic materials are Iron$\left(\mathrm{Fe}\right)$, Cobalt$\left(\mathrm{Co}\right)$, and Nickel $\left(\mathrm{Ni}\right)$.

Paramagnetic material:

• The material that is weakly attracted by a magnetic field is known as Paramagnetic material
• Some examples of paramagnetic materials are Manganese$\left(\mathrm{Mn}\right)$ and Aluminium$\left(\mathrm{Al}\right)$.

Diamagnetic material:

• The material that is not strongly repelled by a magnetic field is known as Diamagnetic material.
• Some examples of diamagnetic materials are Gold $\left(\mathrm{Au}\right)$, Copper $\left(\mathrm{Cu}\right)$, and Silver $\left(\mathrm{Ag}\right)$

Explanation for incorrect options:

B. $\mathrm{Cu},\mathrm{Ag},\mathrm{Au}$, these metals are paramagnetic in nature.

C. $\mathrm{Ca}$ is diamagnetic while $\mathrm{Sr}\mathrm{and}\mathrm{Ba}$ are paramagnetic.

D. $\mathrm{Zn},\mathrm{Cd},\mathrm{Hg}$, these metals are diamagnetic in nature.

Hence, the correct option is A i.e. $\mathrm{Fe},\mathrm{Co},\mathrm{Ni}$ are ferromagnetic materials.