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Which one of the following materials cannot be used for permanent magnets?
- a)Alnico
- b)Barium-Ferrite
- c)Carbon-steel
- d)Iron-Cobalt alloy
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which one of the following materials cannot be used for permanent magn...
Of the given material, only iron cobalt alloy cannot be used to make permanent magnets.
Most Upvoted Answer
Which one of the following materials cannot be used for permanent magn...
There are several categories of permanent magnets.
Ordinary bar magnets are made of Iron, usually relatively soft Iron.
The metals in Alnico magnets are indicated by the pairs of letters making up the name, Aluminum, Nickel and Cobalt. Nickel and Cobalt are the ferromagnetic materials. Aluminum has the role of strengthening the domain walls.
Samarium-Cobalt magnets are not surprisingly made of Samarium and Cobalt
Neodymium magnets can be more expansively called Neodymium-Iron-Boron magnets for their composition. They are the strongest of permanent magnets per unit mass at this time, and their strength comes from the rigidity and stability of the domain walls.
My main experience is with ferrite magnets. These include natural loadstone and any permanent magnet made of Iron and Oxygen: Ferrite (magnet). I produced ferrite magnets with hexagonal structures using Barium and Strontium. Manganese, Zinc and Nickel are also used in producing some types of ferrite magnets. Nearly all "refrigerator magnets" are ferrite magnets.
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Which one of the following materials cannot be used for permanent magn...
Permanent Magnets and Materials
Permanent magnets are materials that retain their magnetism even after the removal of an external magnetic field. These magnets are widely used in various applications, including motors, generators, and magnetic storage devices. Some of the commonly used materials for permanent magnets include Alnico, Barium-Ferrite, Carbon-steel, and Iron-Cobalt alloy. However, one of these materials cannot be used for permanent magnets, as explained below.
Iron-Cobalt Alloy
Iron-Cobalt alloy, also known as Kovar, is a magnetic material that exhibits high magnetic permeability and low coercivity. This material has a low Curie temperature, which means that it loses its magnetic properties at relatively low temperatures. Therefore, Iron-Cobalt alloy cannot be used for permanent magnets because it cannot retain its magnetism at room temperature or higher temperatures. However, Iron-Cobalt alloy is commonly used for magnetic shielding and in other applications where high magnetic permeability is required.
Other Materials for Permanent Magnets
Alnico: Alnico is an alloy of Aluminum, Nickel, Cobalt, and Iron that exhibits good magnetic properties at high temperatures. This material is widely used in various applications, including motors, generators, and sensors.
Barium-Ferrite: Barium-Ferrite is a ceramic material that exhibits high coercivity and high magnetic remanence. This material is commonly used in magnetic storage devices, such as hard drives and magnetic tape.
Carbon-steel: Carbon-steel is a ferromagnetic material that exhibits good magnetic properties when magnetized. This material is commonly used for permanent magnets in various applications, including speakers and magnetic separators.
Conclusion
In conclusion, Iron-Cobalt alloy cannot be used for permanent magnets because it loses its magnetism at relatively low temperatures. However, other materials, such as Alnico, Barium-Ferrite, and Carbon-steel, exhibit good magnetic properties at room temperature and higher temperatures and are commonly used for permanent magnets in various applications.
Permanent magnets are materials that retain their magnetism even after the removal of an external magnetic field. These magnets are widely used in various applications, including motors, generators, and magnetic storage devices. Some of the commonly used materials for permanent magnets include Alnico, Barium-Ferrite, Carbon-steel, and Iron-Cobalt alloy. However, one of these materials cannot be used for permanent magnets, as explained below.
Iron-Cobalt Alloy
Iron-Cobalt alloy, also known as Kovar, is a magnetic material that exhibits high magnetic permeability and low coercivity. This material has a low Curie temperature, which means that it loses its magnetic properties at relatively low temperatures. Therefore, Iron-Cobalt alloy cannot be used for permanent magnets because it cannot retain its magnetism at room temperature or higher temperatures. However, Iron-Cobalt alloy is commonly used for magnetic shielding and in other applications where high magnetic permeability is required.
Other Materials for Permanent Magnets
Alnico: Alnico is an alloy of Aluminum, Nickel, Cobalt, and Iron that exhibits good magnetic properties at high temperatures. This material is widely used in various applications, including motors, generators, and sensors.
Barium-Ferrite: Barium-Ferrite is a ceramic material that exhibits high coercivity and high magnetic remanence. This material is commonly used in magnetic storage devices, such as hard drives and magnetic tape.
Carbon-steel: Carbon-steel is a ferromagnetic material that exhibits good magnetic properties when magnetized. This material is commonly used for permanent magnets in various applications, including speakers and magnetic separators.
Conclusion
In conclusion, Iron-Cobalt alloy cannot be used for permanent magnets because it loses its magnetism at relatively low temperatures. However, other materials, such as Alnico, Barium-Ferrite, and Carbon-steel, exhibit good magnetic properties at room temperature and higher temperatures and are commonly used for permanent magnets in various applications.
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