Question

Which of the following pairs is that of paramagnetic materials?

• A. Copper and Aluminium
• B. Sodium and Calcium
• C. Lead and Iron
• D. Nickel and Cobalt

Hint:

Paramagnetic materials are weakly attracted to a magnetic field due to the presence of unpaired electrons. Examples include Nickel and Cobalt.

Answer 1

The Correct Option is B

Paramagnetic materials are materials that have unpaired electrons and are weakly attracted to a magnetic field. They do not retain magnetization in the absence of an external magnetic field.
**Sodium and Calcium**: Both sodium and calcium are paramagnetic materials. Sodium has unpaired electrons, and calcium also has unpaired electrons in its atomic structure, which makes both weakly attracted to a magnetic field.
**Copper and Aluminium**: Copper and aluminium are diamagnetic, not paramagnetic.
**Lead and Iron**: Lead is diamagnetic, and iron is ferromagnetic, so this pair does not represent paramagnetic materials.
**Nickel and Cobalt**: Both Nickel and Cobalt are ferromagnetic, not paramagnetic, because they have strong magnetic properties and retain magnetization.