Question

Permanent magnets are made from?

A. paramagentic materials

B. diamagnetic materials

C. ferromagnetic materials

D. dielectric matierals

Answer 1

Concepts and reason

The concept used to solve this problem is the magnetic material property.

Consider the provided options individually and use the concept of permanent magnet to determine the correct option.

Fundamentals

Permanent Magnet:

A permanent magnet is made up of a material which creates its own magnetic field and also gets magnetized. It is made due to orientation of its domains. Domains are formed as a small magnetic field built inside the crystalline structure of ferromagnetic materials.

Normally materials like iron, nickel, or rare-earth metalsare the only substances which are made into magnets and these materials are known as ferromagnetic materials.These materials always experience strong magnetic fields until it retains its magnetic field.

Consider option (A), the paramagnetic materialare weakly attracted in the presence of externally applied magnetic field and induces magnetic field in the opposite direction of the applied magnetic field but for permanent magnet, material with strong attraction to magnetic field are required.So, option (A) is incorrect.

Consider option (B), the diamagnetic material is repelled by a magnetic field, where the induced magnetic field is in the direction opposite to repulsive force. But for permanent magnet, material with strong attraction to magnetic field are required. So, option (B) is incorrect.

Consider option (D), the dielectric material are insulators, but a good dielectric is one which is easily polarized and does not have strong polarization in presence of magnetic field. But for permanent magnet, material with strong attraction to magnetic field are required. So, option (D) is incorrect.

Consider option (C), Ferromagnetic materials are strongly attracted towards the magnet whereas all other substances respond weakly to a magnetic field. Thus, permanent magnets are made from "hard" ferromagnetic materials like alnico and ferrite. So, option (C) is correct.

Ans:

The permanent magnets are made from ferromagnetic materials.