Question

Permanent magnets can be made from:
A. Hard steel
B. Cobalt steel
C. Stainless steel
D. Wrought iron

Answer 1

We know that a magnetic object is made up of magnetic material. This material can magnetize and create its own magnetic field. This kind of object is known as a permanent magnet. This kind of object is not able to be made with pure metals. Because of the required magnetic property, alloy is the suitable material for making permanent magnets. Magnets have two poles. One is North Pole and another one is South Pole. The North Pole attracts the South Pole. North Pole repel North Pole and South Pole repel South Pole.

Complete step by step answer:
We know that magnetic force is one of the important forces in nature. By using the magnetic field and magnetic potential, we can generate direct current DC and alternating current AC by using magnet and coils.
The permanent magnets have strong ferromagnetic properties. Ferromagnetic magnets are made using metals like iron, cobalt and nickel.
Wrought iron is an iron alloy with very less carbon content. It is tough, malleable, ductile, corrosion resistant and easily welded. Due to these properties, it is best suitable for making permanent magnets.
Hence, option D is correct.
The other kinds of magnets that are made up of hard steel, cobalt steel, and stainless steel are used in electric control doors, electric appliances controls and magnetic stirrer in chemical reactors

Hence, the correct answer is D.

Note: We should remember, the material that produces a magnetic field, that material is known as magnet. The magnetic properties of the material are widely classified as paramagnetic, diamagnetic, ferromagnetic and antiferromagnetic. This classification of magnet is based on unpaired electrons in its valence shell. If one element all valence orbitals are completely filled means, this magnetic property comes under diamagnetic orbitals. If an element having one unpaired electron in a valence shell is also called as paramagnetic. Though wrought iron is not manufactured in today’s world as it is very costly, it is the best suitable metal for production of permanent magnets.