In the field of electromagnetism, magnetic susceptibility is an estimation of whether a substance will be magnetised in applied magnetic fields. It is represented by the symbol χ. It is basically the ratio of magnetisation M to the applied magnetising field intensity H. As per this quantity, materials can be classified into two categories based on how materials react to applied magnetic fields. Magnetic substances which align with magnetic fields are called paramagnetic materials. In this case, susceptibility is χ>0, which points out that there is always a tiny positive value for paramagnetic materials. Magnetic substances which align against the magnetic fields are called diamagnetic materials. In this case, magnetic susceptibility is χ<0, which points out that there is always a negative value for diamagnetic substances.
Magnetic Susceptibility Questions with Answers
1) What is meant by a magnet?
A magnet is a substance or body that generates magnetic fields. These magnetic fields are invisible but are responsible for the most prominent property of magnets: a force that attracts other ferromagnetic substances, such as steel, nickel, iron, cobalt, etc. It repels or attracts other magnets based on the orientation of their poles.
2) What is meant by magnetic susceptibility?
In the field of electromagnetism, magnetic susceptibility is an estimation of whether a substance will be magnetised in applied magnetic fields.
3) What is the symbol used to denote magnetic susceptibility?
Magnetic susceptibility is denoted by the symbol χ.
4) Magnetic susceptibility shows whether a substance is repelled out of or attracted into a ______.
Answer: magnetic field
Explanation: Magnetic susceptibility shows whether a substance is repelled out of or attracted to a magnetic field.
5) _______ force is a kind of physical interaction that happens between electrically activated particles.
Answer: Electromagnetic
Explanation: Electromagnetic force is a kind of physical interaction that happens between electrically activated particles
6) What is the magnetic susceptibility formula?
χ = M/H
Where,
χ = magnetic susceptibility
M = magnetization
H = field intensity
7) What are the main types of magnets?
According to magnetic susceptibility, magnetic substances can be categorised as a ferromagnetic material, paramagnetic material, and diamagnetic material.
8) What is meant by a ferromagnetic material?
Magnetic substances that are extremely magnetised in a magnetic field are called ferromagnetic materials. These materials are greatly attracted by conventional magnets and move from lesser fields to greater fields. Ferromagnetic substances do possess a stable relative permeability and change from 103 to 105. Magnetic susceptibility is positive and very high and depends on the exerted field. Nickel, cobalt, iron, and their alloys are common examples of ferromagnetic materials.
9) What is meant by a paramagnetic material?
Magnetic substances which align with magnetic fields are called paramagnetic materials. In this case, susceptibility is χ>0, which points out that there is always a tiny positive value for paramagnetic materials. These substances are temperature sensitive and are weekly influenced by magnets with relative permeability from 1.00001 to 1.003. Oxygen, aluminium, alkaline earth metals, etc., are a few examples of paramagnetic substances.
10) What is meant by a diamagnetic material?
Magnetic substances which align against the magnetic fields are called diamagnetic materials. In this case, magnetic susceptibility is χ<0, which points out that there is always a negative value for diamagnetic substances. Such materials are not temperature sensitive. As these substances magnetise in the opposite direction, they can have a small value of magnetisation intensity. Water, mercury, gold, tin, etc., are some of the common examples of diamagnetic substances. These materials possess a stable relative permeability.
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Practice Questions
1) What is meant by a magnet?
2) What is meant by the poles of a magnet?
3) What is the main difference between paramagnetic materials and diamagnetic materials?
4) What is meant by a magnetic field?
5) What is the relationship between magnetic susceptibility and temperature?
6) What is the principle behind electromagnets?
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